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Finding the Fourth Proportional to 1,217.97, 1,679.90 and 775.56

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Solution

The fourth proportional to 1,217.97, 1,679.90 and 775.56 is: 1,069.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,217.97 : 1,679.90 = 775.56 : x
  2. Step 2: Convert to fraction form
    1,217.97/1,679.90 = 775.56/x
  3. Step 3: Cross multiply
    1,217.97x = 1,679.90 × 775.56
  4. Step 4: Simplify right side
    1,217.97x = 1,302,863.24
  5. Step 5: Solve for x
    x = 1,302,863.24/1,217.97
  6. Step 6: Final answer
    x = 1,069.70

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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.