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Finding the Fourth Proportional to 218,902.80, 328,329.90 and 61,147.20

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Solution

The fourth proportional to 218,902.80, 328,329.90 and 61,147.20 is: 91,714.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,902.80 : 328,329.90 = 61,147.20 : x
  2. Step 2: Convert to fraction form
    218,902.80/328,329.90 = 61,147.20/x
  3. Step 3: Cross multiply
    218,902.80x = 328,329.90 × 61,147.20
  4. Step 4: Simplify right side
    218,902.80x = 20,076,454,061.28
  5. Step 5: Solve for x
    x = 20,076,454,061.28/218,902.80
  6. Step 6: Final answer
    x = 91,714.01

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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.