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Finding the Fourth Proportional to 1,217.22, 1,679.56 and 686.04

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Solution

The fourth proportional to 1,217.22, 1,679.56 and 686.04 is: 946.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,217.22 : 1,679.56 = 686.04 : x
  2. Step 2: Convert to fraction form
    1,217.22/1,679.56 = 686.04/x
  3. Step 3: Cross multiply
    1,217.22x = 1,679.56 × 686.04
  4. Step 4: Simplify right side
    1,217.22x = 1,152,245.34
  5. Step 5: Solve for x
    x = 1,152,245.34/1,217.22
  6. Step 6: Final answer
    x = 946.62

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.