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Finding the Fourth Proportional to 90,679.08, 135,981.29 and 39,391.03

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Solution

The fourth proportional to 90,679.08, 135,981.29 and 39,391.03 is: 59,070.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,679.08 : 135,981.29 = 39,391.03 : x
  2. Step 2: Convert to fraction form
    90,679.08/135,981.29 = 39,391.03/x
  3. Step 3: Cross multiply
    90,679.08x = 135,981.29 × 39,391.03
  4. Step 4: Simplify right side
    90,679.08x = 5,356,442,635.40
  5. Step 5: Solve for x
    x = 5,356,442,635.40/90,679.08
  6. Step 6: Final answer
    x = 59,070.32

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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.