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Finding the Fourth Proportional to 820.71, 1,231.38 and 387.90

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Solution

The fourth proportional to 820.71, 1,231.38 and 387.90 is: 582.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    820.71 : 1,231.38 = 387.90 : x
  2. Step 2: Convert to fraction form
    820.71/1,231.38 = 387.90/x
  3. Step 3: Cross multiply
    820.71x = 1,231.38 × 387.90
  4. Step 4: Simplify right side
    820.71x = 477,652.30
  5. Step 5: Solve for x
    x = 477,652.30/820.71
  6. Step 6: Final answer
    x = 582.00

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.