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Finding the Fourth Proportional to 129,467.53, 178,641.35 and 72,866.89

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Solution

The fourth proportional to 129,467.53, 178,641.35 and 72,866.89 is: 100,542.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,467.53 : 178,641.35 = 72,866.89 : x
  2. Step 2: Convert to fraction form
    129,467.53/178,641.35 = 72,866.89/x
  3. Step 3: Cross multiply
    129,467.53x = 178,641.35 × 72,866.89
  4. Step 4: Simplify right side
    129,467.53x = 13,017,039,235.57
  5. Step 5: Solve for x
    x = 13,017,039,235.57/129,467.53
  6. Step 6: Final answer
    x = 100,542.89

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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.