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Finding the Fourth Proportional to 81,656.25, 122,501.87 and 28,349.90

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Solution

The fourth proportional to 81,656.25, 122,501.87 and 28,349.90 is: 42,530.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,656.25 : 122,501.87 = 28,349.90 : x
  2. Step 2: Convert to fraction form
    81,656.25/122,501.87 = 28,349.90/x
  3. Step 3: Cross multiply
    81,656.25x = 122,501.87 × 28,349.90
  4. Step 4: Simplify right side
    81,656.25x = 3,472,915,575.75
  5. Step 5: Solve for x
    x = 3,472,915,575.75/81,656.25
  6. Step 6: Final answer
    x = 42,530.92

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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.