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Finding the Fourth Proportional to 1,316.92, 1,972.70 and 821.70

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Solution

The fourth proportional to 1,316.92, 1,972.70 and 821.70 is: 1,230.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,316.92 : 1,972.70 = 821.70 : x
  2. Step 2: Convert to fraction form
    1,316.92/1,972.70 = 821.70/x
  3. Step 3: Cross multiply
    1,316.92x = 1,972.70 × 821.70
  4. Step 4: Simplify right side
    1,316.92x = 1,620,967.59
  5. Step 5: Solve for x
    x = 1,620,967.59/1,316.92
  6. Step 6: Final answer
    x = 1,230.88

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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.