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Finding the Fourth Proportional to 85,909.40, 128,645.40 and 81,972.80

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Solution

The fourth proportional to 85,909.40, 128,645.40 and 81,972.80 is: 122,750.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,909.40 : 128,645.40 = 81,972.80 : x
  2. Step 2: Convert to fraction form
    85,909.40/128,645.40 = 81,972.80/x
  3. Step 3: Cross multiply
    85,909.40x = 128,645.40 × 81,972.80
  4. Step 4: Simplify right side
    85,909.40x = 10,545,423,645.12
  5. Step 5: Solve for x
    x = 10,545,423,645.12/85,909.40
  6. Step 6: Final answer
    x = 122,750.52

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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.