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Finding the Fourth Proportional to 1,239.22, 1,710.15 and 679.74

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Solution

The fourth proportional to 1,239.22, 1,710.15 and 679.74 is: 938.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,239.22 : 1,710.15 = 679.74 : x
  2. Step 2: Convert to fraction form
    1,239.22/1,710.15 = 679.74/x
  3. Step 3: Cross multiply
    1,239.22x = 1,710.15 × 679.74
  4. Step 4: Simplify right side
    1,239.22x = 1,162,463.85
  5. Step 5: Solve for x
    x = 1,162,463.85/1,239.22
  6. Step 6: Final answer
    x = 938.06

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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.