Home / 638,390.87-880,985.38-351,921.20

Finding the Fourth Proportional to 638,390.87, 880,985.38 and 351,921.20

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Solution

The fourth proportional to 638,390.87, 880,985.38 and 351,921.20 is: 485,654.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    638,390.87 : 880,985.38 = 351,921.20 : x
  2. Step 2: Convert to fraction form
    638,390.87/880,985.38 = 351,921.20/x
  3. Step 3: Cross multiply
    638,390.87x = 880,985.38 × 351,921.20
  4. Step 4: Simplify right side
    638,390.87x = 310,037,432,112.06
  5. Step 5: Solve for x
    x = 310,037,432,112.06/638,390.87
  6. Step 6: Final answer
    x = 485,654.56

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.