Home / 15,463.78-21,340.01-8,390.20

Finding the Fourth Proportional to 15,463.78, 21,340.01 and 8,390.20

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Solution

The fourth proportional to 15,463.78, 21,340.01 and 8,390.20 is: 11,578.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,463.78 : 21,340.01 = 8,390.20 : x
  2. Step 2: Convert to fraction form
    15,463.78/21,340.01 = 8,390.20/x
  3. Step 3: Cross multiply
    15,463.78x = 21,340.01 × 8,390.20
  4. Step 4: Simplify right side
    15,463.78x = 179,046,803.25
  5. Step 5: Solve for x
    x = 179,046,803.25/15,463.78
  6. Step 6: Final answer
    x = 11,578.47

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Half scale
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Double scale
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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.