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Finding the Fourth Proportional to 129,340.70, 178,488.33 and 72,751.94

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Solution

The fourth proportional to 129,340.70, 178,488.33 and 72,751.94 is: 100,396.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,340.70 : 178,488.33 = 72,751.94 : x
  2. Step 2: Convert to fraction form
    129,340.70/178,488.33 = 72,751.94/x
  3. Step 3: Cross multiply
    129,340.70x = 178,488.33 × 72,751.94
  4. Step 4: Simplify right side
    129,340.70x = 12,985,372,274.86
  5. Step 5: Solve for x
    x = 12,985,372,274.86/129,340.70
  6. Step 6: Final answer
    x = 100,396.64

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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.