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Finding the Fourth Proportional to 128,850.70, 177,807.96 and 71,489.41

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Solution

The fourth proportional to 128,850.70, 177,807.96 and 71,489.41 is: 98,652.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,850.70 : 177,807.96 = 71,489.41 : x
  2. Step 2: Convert to fraction form
    128,850.70/177,807.96 = 71,489.41/x
  3. Step 3: Cross multiply
    128,850.70x = 177,807.96 × 71,489.41
  4. Step 4: Simplify right side
    128,850.70x = 12,711,386,153.70
  5. Step 5: Solve for x
    x = 12,711,386,153.70/128,850.70
  6. Step 6: Final answer
    x = 98,652.05

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.