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Finding the Fourth Proportional to 72,939.62, 109,427.88 and 20,349.08

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Solution

The fourth proportional to 72,939.62, 109,427.88 and 20,349.08 is: 30,528.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,939.62 : 109,427.88 = 20,349.08 : x
  2. Step 2: Convert to fraction form
    72,939.62/109,427.88 = 20,349.08/x
  3. Step 3: Cross multiply
    72,939.62x = 109,427.88 × 20,349.08
  4. Step 4: Simplify right side
    72,939.62x = 2,226,756,684.35
  5. Step 5: Solve for x
    x = 2,226,756,684.35/72,939.62
  6. Step 6: Final answer
    x = 30,528.77

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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.