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Finding the Fourth Proportional to 112,593.72, 155,400.18 and 72,357.78

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Solution

The fourth proportional to 112,593.72, 155,400.18 and 72,357.78 is: 99,867.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    112,593.72 : 155,400.18 = 72,357.78 : x
  2. Step 2: Convert to fraction form
    112,593.72/155,400.18 = 72,357.78/x
  3. Step 3: Cross multiply
    112,593.72x = 155,400.18 × 72,357.78
  4. Step 4: Simplify right side
    112,593.72x = 11,244,412,036.40
  5. Step 5: Solve for x
    x = 11,244,412,036.40/112,593.72
  6. Step 6: Final answer
    x = 99,867.13

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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.