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Finding the Fourth Proportional to 129,520, 178,738.14 and 72,932.32

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Solution

The fourth proportional to 129,520, 178,738.14 and 72,932.32 is: 100,646.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,520 : 178,738.14 = 72,932.32 : x
  2. Step 2: Convert to fraction form
    129,520/178,738.14 = 72,932.32/x
  3. Step 3: Cross multiply
    129,520x = 178,738.14 × 72,932.32
  4. Step 4: Simplify right side
    129,520x = 13,035,787,222.68
  5. Step 5: Solve for x
    x = 13,035,787,222.68/129,520
  6. Step 6: Final answer
    x = 100,646.91

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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.