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Finding the Fourth Proportional to 90,691.28, 135,777.72 and 69,955.28

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Solution

The fourth proportional to 90,691.28, 135,777.72 and 69,955.28 is: 104,732.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,691.28 : 135,777.72 = 69,955.28 : x
  2. Step 2: Convert to fraction form
    90,691.28/135,777.72 = 69,955.28/x
  3. Step 3: Cross multiply
    90,691.28x = 135,777.72 × 69,955.28
  4. Step 4: Simplify right side
    90,691.28x = 9,498,368,420.36
  5. Step 5: Solve for x
    x = 9,498,368,420.36/90,691.28
  6. Step 6: Final answer
    x = 104,732.98

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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.