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Finding the Fourth Proportional to 129,249.47, 178,350.63 and 71,879.48

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Solution

The fourth proportional to 129,249.47, 178,350.63 and 71,879.48 is: 99,186.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,249.47 : 178,350.63 = 71,879.48 : x
  2. Step 2: Convert to fraction form
    129,249.47/178,350.63 = 71,879.48/x
  3. Step 3: Cross multiply
    129,249.47x = 178,350.63 × 71,879.48
  4. Step 4: Simplify right side
    129,249.47x = 12,819,750,542.07
  5. Step 5: Solve for x
    x = 12,819,750,542.07/129,249.47
  6. Step 6: Final answer
    x = 99,186.10

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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.