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Finding the Fourth Proportional to 1,321.31, 1,981.82 and 347.28

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Solution

The fourth proportional to 1,321.31, 1,981.82 and 347.28 is: 520.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,321.31 : 1,981.82 = 347.28 : x
  2. Step 2: Convert to fraction form
    1,321.31/1,981.82 = 347.28/x
  3. Step 3: Cross multiply
    1,321.31x = 1,981.82 × 347.28
  4. Step 4: Simplify right side
    1,321.31x = 688,246.45
  5. Step 5: Solve for x
    x = 688,246.45/1,321.31
  6. Step 6: Final answer
    x = 520.88

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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.