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Finding the Fourth Proportional to 90,509.52, 135,863.60 and 71,909.12

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Solution

The fourth proportional to 90,509.52, 135,863.60 and 71,909.12 is: 107,942.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,509.52 : 135,863.60 = 71,909.12 : x
  2. Step 2: Convert to fraction form
    90,509.52/135,863.60 = 71,909.12/x
  3. Step 3: Cross multiply
    90,509.52x = 135,863.60 × 71,909.12
  4. Step 4: Simplify right side
    90,509.52x = 9,769,831,916.03
  5. Step 5: Solve for x
    x = 9,769,831,916.03/90,509.52
  6. Step 6: Final answer
    x = 107,942.59

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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.