Home / 30,929.60-42,687.24-20,349.92

Finding the Fourth Proportional to 30,929.60, 42,687.24 and 20,349.92

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Solution

The fourth proportional to 30,929.60, 42,687.24 and 20,349.92 is: 28,085.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,929.60 : 42,687.24 = 20,349.92 : x
  2. Step 2: Convert to fraction form
    30,929.60/42,687.24 = 20,349.92/x
  3. Step 3: Cross multiply
    30,929.60x = 42,687.24 × 20,349.92
  4. Step 4: Simplify right side
    30,929.60x = 868,681,919.02
  5. Step 5: Solve for x
    x = 868,681,919.02/30,929.60
  6. Step 6: Final answer
    x = 28,085.78

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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.