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Finding the Fourth Proportional to 90,737.60, 136,088.64 and 86,236.82

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Solution

The fourth proportional to 90,737.60, 136,088.64 and 86,236.82 is: 129,338.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,737.60 : 136,088.64 = 86,236.82 : x
  2. Step 2: Convert to fraction form
    90,737.60/136,088.64 = 86,236.82/x
  3. Step 3: Cross multiply
    90,737.60x = 136,088.64 × 86,236.82
  4. Step 4: Simplify right side
    90,737.60x = 11,735,851,551.72
  5. Step 5: Solve for x
    x = 11,735,851,551.72/90,737.60
  6. Step 6: Final answer
    x = 129,338.35

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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.