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Finding the Fourth Proportional to 215,821.80, 323,732.70 and 66,061.80

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Solution

The fourth proportional to 215,821.80, 323,732.70 and 66,061.80 is: 99,092.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    215,821.80 : 323,732.70 = 66,061.80 : x
  2. Step 2: Convert to fraction form
    215,821.80/323,732.70 = 66,061.80/x
  3. Step 3: Cross multiply
    215,821.80x = 323,732.70 × 66,061.80
  4. Step 4: Simplify right side
    215,821.80x = 21,386,364,880.86
  5. Step 5: Solve for x
    x = 21,386,364,880.86/215,821.80
  6. Step 6: Final answer
    x = 99,092.70

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.