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Finding the Fourth Proportional to 129,322.98, 178,458.12 and 71,960.40

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Solution

The fourth proportional to 129,322.98, 178,458.12 and 71,960.40 is: 99,301.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,322.98 : 178,458.12 = 71,960.40 : x
  2. Step 2: Convert to fraction form
    129,322.98/178,458.12 = 71,960.40/x
  3. Step 3: Cross multiply
    129,322.98x = 178,458.12 × 71,960.40
  4. Step 4: Simplify right side
    129,322.98x = 12,841,917,698.45
  5. Step 5: Solve for x
    x = 12,841,917,698.45/129,322.98
  6. Step 6: Final answer
    x = 99,301.13

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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.