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Finding the Fourth Proportional to 621.14, 856.85 and 372.30

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Solution

The fourth proportional to 621.14, 856.85 and 372.30 is: 513.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.14 : 856.85 = 372.30 : x
  2. Step 2: Convert to fraction form
    621.14/856.85 = 372.30/x
  3. Step 3: Cross multiply
    621.14x = 856.85 × 372.30
  4. Step 4: Simplify right side
    621.14x = 319,003.39
  5. Step 5: Solve for x
    x = 319,003.39/621.14
  6. Step 6: Final answer
    x = 513.58

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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.