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Finding the Fourth Proportional to 821.76, 1,232.08 and 431.98

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Solution

The fourth proportional to 821.76, 1,232.08 and 431.98 is: 647.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    821.76 : 1,232.08 = 431.98 : x
  2. Step 2: Convert to fraction form
    821.76/1,232.08 = 431.98/x
  3. Step 3: Cross multiply
    821.76x = 1,232.08 × 431.98
  4. Step 4: Simplify right side
    821.76x = 532,233.92
  5. Step 5: Solve for x
    x = 532,233.92/821.76
  6. Step 6: Final answer
    x = 647.68

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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.