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Finding the Fourth Proportional to 72,424.64, 108,640.20 and 19,832.96

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Solution

The fourth proportional to 72,424.64, 108,640.20 and 19,832.96 is: 29,750.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,424.64 : 108,640.20 = 19,832.96 : x
  2. Step 2: Convert to fraction form
    72,424.64/108,640.20 = 19,832.96/x
  3. Step 3: Cross multiply
    72,424.64x = 108,640.20 × 19,832.96
  4. Step 4: Simplify right side
    72,424.64x = 2,154,656,740.99
  5. Step 5: Solve for x
    x = 2,154,656,740.99/72,424.64
  6. Step 6: Final answer
    x = 29,750.33

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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.