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Finding the Fourth Proportional to 72,939.80, 109,443.72 and 28,555.04

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Solution

The fourth proportional to 72,939.80, 109,443.72 and 28,555.04 is: 42,845.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,939.80 : 109,443.72 = 28,555.04 : x
  2. Step 2: Convert to fraction form
    72,939.80/109,443.72 = 28,555.04/x
  3. Step 3: Cross multiply
    72,939.80x = 109,443.72 × 28,555.04
  4. Step 4: Simplify right side
    72,939.80x = 3,125,169,802.35
  5. Step 5: Solve for x
    x = 3,125,169,802.35/72,939.80
  6. Step 6: Final answer
    x = 42,845.88

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.