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Finding the Fourth Proportional to 129,009.51, 178,033.56 and 71,648.97

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Solution

The fourth proportional to 129,009.51, 178,033.56 and 71,648.97 is: 98,875.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,009.51 : 178,033.56 = 71,648.97 : x
  2. Step 2: Convert to fraction form
    129,009.51/178,033.56 = 71,648.97/x
  3. Step 3: Cross multiply
    129,009.51x = 178,033.56 × 71,648.97
  4. Step 4: Simplify right side
    129,009.51x = 12,755,921,199.43
  5. Step 5: Solve for x
    x = 12,755,921,199.43/129,009.51
  6. Step 6: Final answer
    x = 98,875.82

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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.