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Finding the Fourth Proportional to 129,695.67, 178,980.34 and 72,338.70

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Solution

The fourth proportional to 129,695.67, 178,980.34 and 72,338.70 is: 99,827.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,695.67 : 178,980.34 = 72,338.70 : x
  2. Step 2: Convert to fraction form
    129,695.67/178,980.34 = 72,338.70/x
  3. Step 3: Cross multiply
    129,695.67x = 178,980.34 × 72,338.70
  4. Step 4: Simplify right side
    129,695.67x = 12,947,205,121.16
  5. Step 5: Solve for x
    x = 12,947,205,121.16/129,695.67
  6. Step 6: Final answer
    x = 99,827.58

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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.