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Finding the Fourth Proportional to 89,691.56, 123,783.08 and 66,991.12

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Solution

The fourth proportional to 89,691.56, 123,783.08 and 66,991.12 is: 92,454.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    89,691.56 : 123,783.08 = 66,991.12 : x
  2. Step 2: Convert to fraction form
    89,691.56/123,783.08 = 66,991.12/x
  3. Step 3: Cross multiply
    89,691.56x = 123,783.08 × 66,991.12
  4. Step 4: Simplify right side
    89,691.56x = 8,292,367,166.25
  5. Step 5: Solve for x
    x = 8,292,367,166.25/89,691.56
  6. Step 6: Final answer
    x = 92,454.26

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.