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Finding the Fourth Proportional to 89,403.60, 133,959.60 and 76,864.80

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Solution

The fourth proportional to 89,403.60, 133,959.60 and 76,864.80 is: 115,171.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    89,403.60 : 133,959.60 = 76,864.80 : x
  2. Step 2: Convert to fraction form
    89,403.60/133,959.60 = 76,864.80/x
  3. Step 3: Cross multiply
    89,403.60x = 133,959.60 × 76,864.80
  4. Step 4: Simplify right side
    89,403.60x = 10,296,777,862.08
  5. Step 5: Solve for x
    x = 10,296,777,862.08/89,403.60
  6. Step 6: Final answer
    x = 115,171.85

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1.5x scale

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.