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Finding the Fourth Proportional to 90,665.52, 135,087.01 and 85,572.44

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Solution

The fourth proportional to 90,665.52, 135,087.01 and 85,572.44 is: 127,498.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,665.52 : 135,087.01 = 85,572.44 : x
  2. Step 2: Convert to fraction form
    90,665.52/135,087.01 = 85,572.44/x
  3. Step 3: Cross multiply
    90,665.52x = 135,087.01 × 85,572.44
  4. Step 4: Simplify right side
    90,665.52x = 11,559,725,058.00
  5. Step 5: Solve for x
    x = 11,559,725,058.00/90,665.52
  6. Step 6: Final answer
    x = 127,498.59

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.