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Finding the Fourth Proportional to 1,217.28, 1,679.43 and 693.18

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Solution

The fourth proportional to 1,217.28, 1,679.43 and 693.18 is: 956.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,217.28 : 1,679.43 = 693.18 : x
  2. Step 2: Convert to fraction form
    1,217.28/1,679.43 = 693.18/x
  3. Step 3: Cross multiply
    1,217.28x = 1,679.43 × 693.18
  4. Step 4: Simplify right side
    1,217.28x = 1,164,147.29
  5. Step 5: Solve for x
    x = 1,164,147.29/1,217.28
  6. Step 6: Final answer
    x = 956.35

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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.