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Finding the Fourth Proportional to 621.71, 931.50 and 447.55

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Solution

The fourth proportional to 621.71, 931.50 and 447.55 is: 670.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.71 : 931.50 = 447.55 : x
  2. Step 2: Convert to fraction form
    621.71/931.50 = 447.55/x
  3. Step 3: Cross multiply
    621.71x = 931.50 × 447.55
  4. Step 4: Simplify right side
    621.71x = 416,892.83
  5. Step 5: Solve for x
    x = 416,892.83/621.71
  6. Step 6: Final answer
    x = 670.56

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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.