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Finding the Fourth Proportional to 621.81, 931.92 and 475.02

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Solution

The fourth proportional to 621.81, 931.92 and 475.02 is: 711.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.81 : 931.92 = 475.02 : x
  2. Step 2: Convert to fraction form
    621.81/931.92 = 475.02/x
  3. Step 3: Cross multiply
    621.81x = 931.92 × 475.02
  4. Step 4: Simplify right side
    621.81x = 442,680.64
  5. Step 5: Solve for x
    x = 442,680.64/621.81
  6. Step 6: Final answer
    x = 711.92

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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.