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Finding the Fourth Proportional to 128,737.36, 177,654.52 and 71,376.40

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Solution

The fourth proportional to 128,737.36, 177,654.52 and 71,376.40 is: 98,497.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,737.36 : 177,654.52 = 71,376.40 : x
  2. Step 2: Convert to fraction form
    128,737.36/177,654.52 = 71,376.40/x
  3. Step 3: Cross multiply
    128,737.36x = 177,654.52 × 71,376.40
  4. Step 4: Simplify right side
    128,737.36x = 12,680,340,081.33
  5. Step 5: Solve for x
    x = 12,680,340,081.33/128,737.36
  6. Step 6: Final answer
    x = 98,497.75

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1.5x scale

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.