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Finding the Fourth Proportional to 89,876.60, 134,814.90 and 72,380.60

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Solution

The fourth proportional to 89,876.60, 134,814.90 and 72,380.60 is: 108,570.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    89,876.60 : 134,814.90 = 72,380.60 : x
  2. Step 2: Convert to fraction form
    89,876.60/134,814.90 = 72,380.60/x
  3. Step 3: Cross multiply
    89,876.60x = 134,814.90 × 72,380.60
  4. Step 4: Simplify right side
    89,876.60x = 9,757,983,350.94
  5. Step 5: Solve for x
    x = 9,757,983,350.94/89,876.60
  6. Step 6: Final answer
    x = 108,570.90

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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.