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Finding the Fourth Proportional to 129,572.84, 178,813.46 and 72,218.06

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Solution

The fourth proportional to 129,572.84, 178,813.46 and 72,218.06 is: 99,662.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,572.84 : 178,813.46 = 72,218.06 : x
  2. Step 2: Convert to fraction form
    129,572.84/178,813.46 = 72,218.06/x
  3. Step 3: Cross multiply
    129,572.84x = 178,813.46 × 72,218.06
  4. Step 4: Simplify right side
    129,572.84x = 12,913,560,469.57
  5. Step 5: Solve for x
    x = 12,913,560,469.57/129,572.84
  6. Step 6: Final answer
    x = 99,662.55

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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.