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Finding the Fourth Proportional to 1,321.29, 1,981.76 and 347.46

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Solution

The fourth proportional to 1,321.29, 1,981.76 and 347.46 is: 521.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,321.29 : 1,981.76 = 347.46 : x
  2. Step 2: Convert to fraction form
    1,321.29/1,981.76 = 347.46/x
  3. Step 3: Cross multiply
    1,321.29x = 1,981.76 × 347.46
  4. Step 4: Simplify right side
    1,321.29x = 688,580.59
  5. Step 5: Solve for x
    x = 688,580.59/1,321.29
  6. Step 6: Final answer
    x = 521.14

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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.