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Finding the Fourth Proportional to 15,429, 21,292.13 and 8,355.43

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Solution

The fourth proportional to 15,429, 21,292.13 and 8,355.43 is: 11,530.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,429 : 21,292.13 = 8,355.43 : x
  2. Step 2: Convert to fraction form
    15,429/21,292.13 = 8,355.43/x
  3. Step 3: Cross multiply
    15,429x = 21,292.13 × 8,355.43
  4. Step 4: Simplify right side
    15,429x = 177,904,901.77
  5. Step 5: Solve for x
    x = 177,904,901.77/15,429
  6. Step 6: Final answer
    x = 11,530.55

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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.