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Finding the Fourth Proportional to 637.80, 879.98 and 385.62

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Solution

The fourth proportional to 637.80, 879.98 and 385.62 is: 532.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    637.80 : 879.98 = 385.62 : x
  2. Step 2: Convert to fraction form
    637.80/879.98 = 385.62/x
  3. Step 3: Cross multiply
    637.80x = 879.98 × 385.62
  4. Step 4: Simplify right side
    637.80x = 339,337.89
  5. Step 5: Solve for x
    x = 339,337.89/637.80
  6. Step 6: Final answer
    x = 532.04

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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.