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Finding the Fourth Proportional to 15,691.92, 21,645.81 and 9,400.65

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Solution

The fourth proportional to 15,691.92, 21,645.81 and 9,400.65 is: 12,967.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,691.92 : 21,645.81 = 9,400.65 : x
  2. Step 2: Convert to fraction form
    15,691.92/21,645.81 = 9,400.65/x
  3. Step 3: Cross multiply
    15,691.92x = 21,645.81 × 9,400.65
  4. Step 4: Simplify right side
    15,691.92x = 203,484,683.78
  5. Step 5: Solve for x
    x = 203,484,683.78/15,691.92
  6. Step 6: Final answer
    x = 12,967.48

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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.