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Finding the Fourth Proportional to 89,913.20, 134,691.60 and 78,832.40

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Solution

The fourth proportional to 89,913.20, 134,691.60 and 78,832.40 is: 118,092.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    89,913.20 : 134,691.60 = 78,832.40 : x
  2. Step 2: Convert to fraction form
    89,913.20/134,691.60 = 78,832.40/x
  3. Step 3: Cross multiply
    89,913.20x = 134,691.60 × 78,832.40
  4. Step 4: Simplify right side
    89,913.20x = 10,618,062,087.84
  5. Step 5: Solve for x
    x = 10,618,062,087.84/89,913.20
  6. Step 6: Final answer
    x = 118,092.36

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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.