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Finding the Fourth Proportional to 91,805.20, 137,788.80 and 54,318.40

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Solution

The fourth proportional to 91,805.20, 137,788.80 and 54,318.40 is: 81,525.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,805.20 : 137,788.80 = 54,318.40 : x
  2. Step 2: Convert to fraction form
    91,805.20/137,788.80 = 54,318.40/x
  3. Step 3: Cross multiply
    91,805.20x = 137,788.80 × 54,318.40
  4. Step 4: Simplify right side
    91,805.20x = 7,484,467,153.92
  5. Step 5: Solve for x
    x = 7,484,467,153.92/91,805.20
  6. Step 6: Final answer
    x = 81,525.53

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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.