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Finding the Fourth Proportional to 91,472.80, 137,219.28 and 29,128.96

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Solution

The fourth proportional to 91,472.80, 137,219.28 and 29,128.96 is: 43,696.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,472.80 : 137,219.28 = 29,128.96 : x
  2. Step 2: Convert to fraction form
    91,472.80/137,219.28 = 29,128.96/x
  3. Step 3: Cross multiply
    91,472.80x = 137,219.28 × 29,128.96
  4. Step 4: Simplify right side
    91,472.80x = 3,997,054,918.35
  5. Step 5: Solve for x
    x = 3,997,054,918.35/91,472.80
  6. Step 6: Final answer
    x = 43,696.65

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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.