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Finding the Fourth Proportional to 89,891.61, 134,708.90 and 66,011.80

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Solution

The fourth proportional to 89,891.61, 134,708.90 and 66,011.80 is: 98,923.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    89,891.61 : 134,708.90 = 66,011.80 : x
  2. Step 2: Convert to fraction form
    89,891.61/134,708.90 = 66,011.80/x
  3. Step 3: Cross multiply
    89,891.61x = 134,708.90 × 66,011.80
  4. Step 4: Simplify right side
    89,891.61x = 8,892,376,965.02
  5. Step 5: Solve for x
    x = 8,892,376,965.02/89,891.61
  6. Step 6: Final answer
    x = 98,923.33

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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.