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Finding the Fourth Proportional to 621.24, 856.92 and 372.39

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Solution

The fourth proportional to 621.24, 856.92 and 372.39 is: 513.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.24 : 856.92 = 372.39 : x
  2. Step 2: Convert to fraction form
    621.24/856.92 = 372.39/x
  3. Step 3: Cross multiply
    621.24x = 856.92 × 372.39
  4. Step 4: Simplify right side
    621.24x = 319,108.44
  5. Step 5: Solve for x
    x = 319,108.44/621.24
  6. Step 6: Final answer
    x = 513.66

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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.