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Finding the Fourth Proportional to 72,919.20, 109,381.24 and 20,324.28

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Solution

The fourth proportional to 72,919.20, 109,381.24 and 20,324.28 is: 30,487.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,919.20 : 109,381.24 = 20,324.28 : x
  2. Step 2: Convert to fraction form
    72,919.20/109,381.24 = 20,324.28/x
  3. Step 3: Cross multiply
    72,919.20x = 109,381.24 × 20,324.28
  4. Step 4: Simplify right side
    72,919.20x = 2,223,094,948.51
  5. Step 5: Solve for x
    x = 2,223,094,948.51/72,919.20
  6. Step 6: Final answer
    x = 30,487.10

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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.