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Finding the Fourth Proportional to 129,062.88, 178,119.47 and 74,617.40

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Solution

The fourth proportional to 129,062.88, 178,119.47 and 74,617.40 is: 102,979.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,062.88 : 178,119.47 = 74,617.40 : x
  2. Step 2: Convert to fraction form
    129,062.88/178,119.47 = 74,617.40/x
  3. Step 3: Cross multiply
    129,062.88x = 178,119.47 × 74,617.40
  4. Step 4: Simplify right side
    129,062.88x = 13,290,811,740.78
  5. Step 5: Solve for x
    x = 13,290,811,740.78/129,062.88
  6. Step 6: Final answer
    x = 102,979.35

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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.