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Finding the Fourth Proportional to 72,255.40, 108,383.28 and 38,991.12

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Solution

The fourth proportional to 72,255.40, 108,383.28 and 38,991.12 is: 58,486.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,255.40 : 108,383.28 = 38,991.12 : x
  2. Step 2: Convert to fraction form
    72,255.40/108,383.28 = 38,991.12/x
  3. Step 3: Cross multiply
    72,255.40x = 108,383.28 × 38,991.12
  4. Step 4: Simplify right side
    72,255.40x = 4,225,985,476.47
  5. Step 5: Solve for x
    x = 4,225,985,476.47/72,255.40
  6. Step 6: Final answer
    x = 58,486.78

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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.