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Finding the Fourth Proportional to 28,209.67, 38,929.34 and 15,463.71

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Solution

The fourth proportional to 28,209.67, 38,929.34 and 15,463.71 is: 21,339.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,209.67 : 38,929.34 = 15,463.71 : x
  2. Step 2: Convert to fraction form
    28,209.67/38,929.34 = 15,463.71/x
  3. Step 3: Cross multiply
    28,209.67x = 38,929.34 × 15,463.71
  4. Step 4: Simplify right side
    28,209.67x = 601,992,062.91
  5. Step 5: Solve for x
    x = 601,992,062.91/28,209.67
  6. Step 6: Final answer
    x = 21,339.92

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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.