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Finding the Fourth Proportional to 621.92, 931.68 and 378.32

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Solution

The fourth proportional to 621.92, 931.68 and 378.32 is: 566.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.92 : 931.68 = 378.32 : x
  2. Step 2: Convert to fraction form
    621.92/931.68 = 378.32/x
  3. Step 3: Cross multiply
    621.92x = 931.68 × 378.32
  4. Step 4: Simplify right side
    621.92x = 352,473.18
  5. Step 5: Solve for x
    x = 352,473.18/621.92
  6. Step 6: Final answer
    x = 566.75

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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.