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Finding the Fourth Proportional to 1,298.12, 1,945.55 and 649.04

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Solution

The fourth proportional to 1,298.12, 1,945.55 and 649.04 is: 972.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,298.12 : 1,945.55 = 649.04 : x
  2. Step 2: Convert to fraction form
    1,298.12/1,945.55 = 649.04/x
  3. Step 3: Cross multiply
    1,298.12x = 1,945.55 × 649.04
  4. Step 4: Simplify right side
    1,298.12x = 1,262,731.67
  5. Step 5: Solve for x
    x = 1,262,731.67/1,298.12
  6. Step 6: Final answer
    x = 972.74

Related Problems

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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 (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.