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Finding the Fourth Proportional to 621.57, 857.79 and 372.92

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Solution

The fourth proportional to 621.57, 857.79 and 372.92 is: 514.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.57 : 857.79 = 372.92 : x
  2. Step 2: Convert to fraction form
    621.57/857.79 = 372.92/x
  3. Step 3: Cross multiply
    621.57x = 857.79 × 372.92
  4. Step 4: Simplify right side
    621.57x = 319,882.76
  5. Step 5: Solve for x
    x = 319,882.76/621.57
  6. Step 6: Final answer
    x = 514.63

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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.