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Finding the Fourth Proportional to 128,540.32, 177,402.36 and 71,963.44

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Solution

The fourth proportional to 128,540.32, 177,402.36 and 71,963.44 is: 99,318.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,540.32 : 177,402.36 = 71,963.44 : x
  2. Step 2: Convert to fraction form
    128,540.32/177,402.36 = 71,963.44/x
  3. Step 3: Cross multiply
    128,540.32x = 177,402.36 × 71,963.44
  4. Step 4: Simplify right side
    128,540.32x = 12,766,484,089.72
  5. Step 5: Solve for x
    x = 12,766,484,089.72/128,540.32
  6. Step 6: Final answer
    x = 99,318.91

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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.