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Finding the Fourth Proportional to 128,874.23, 177,847.41 and 71,513.78

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Solution

The fourth proportional to 128,874.23, 177,847.41 and 71,513.78 is: 98,689.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,874.23 : 177,847.41 = 71,513.78 : x
  2. Step 2: Convert to fraction form
    128,874.23/177,847.41 = 71,513.78/x
  3. Step 3: Cross multiply
    128,874.23x = 177,847.41 × 71,513.78
  4. Step 4: Simplify right side
    128,874.23x = 12,718,539,663.07
  5. Step 5: Solve for x
    x = 12,718,539,663.07/128,874.23
  6. Step 6: Final answer
    x = 98,689.55

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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.