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Finding the Fourth Proportional to 28,115.71, 38,802.15 and 15,542.89

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Solution

The fourth proportional to 28,115.71, 38,802.15 and 15,542.89 is: 21,450.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,115.71 : 38,802.15 = 15,542.89 : x
  2. Step 2: Convert to fraction form
    28,115.71/38,802.15 = 15,542.89/x
  3. Step 3: Cross multiply
    28,115.71x = 38,802.15 × 15,542.89
  4. Step 4: Simplify right side
    28,115.71x = 603,097,549.21
  5. Step 5: Solve for x
    x = 603,097,549.21/28,115.71
  6. Step 6: Final answer
    x = 21,450.55

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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.