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Finding the Fourth Proportional to 29,592.92, 40,789.47 and 20,981.90

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Solution

The fourth proportional to 29,592.92, 40,789.47 and 20,981.90 is: 28,920.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    29,592.92 : 40,789.47 = 20,981.90 : x
  2. Step 2: Convert to fraction form
    29,592.92/40,789.47 = 20,981.90/x
  3. Step 3: Cross multiply
    29,592.92x = 40,789.47 × 20,981.90
  4. Step 4: Simplify right side
    29,592.92x = 855,840,580.59
  5. Step 5: Solve for x
    x = 855,840,580.59/29,592.92
  6. Step 6: Final answer
    x = 28,920.45

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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.