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Finding the Fourth Proportional to 821.41, 1,231.20 and 497.00

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Solution

The fourth proportional to 821.41, 1,231.20 and 497.00 is: 744.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    821.41 : 1,231.20 = 497.00 : x
  2. Step 2: Convert to fraction form
    821.41/1,231.20 = 497.00/x
  3. Step 3: Cross multiply
    821.41x = 1,231.20 × 497.00
  4. Step 4: Simplify right side
    821.41x = 611,909.48
  5. Step 5: Solve for x
    x = 611,909.48/821.41
  6. Step 6: Final answer
    x = 744.95

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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.