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Finding the Fourth Proportional to 1,215.97, 1,678.17 and 711.92

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Solution

The fourth proportional to 1,215.97, 1,678.17 and 711.92 is: 982.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,215.97 : 1,678.17 = 711.92 : x
  2. Step 2: Convert to fraction form
    1,215.97/1,678.17 = 711.92/x
  3. Step 3: Cross multiply
    1,215.97x = 1,678.17 × 711.92
  4. Step 4: Simplify right side
    1,215.97x = 1,194,722.79
  5. Step 5: Solve for x
    x = 1,194,722.79/1,215.97
  6. Step 6: Final answer
    x = 982.53

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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.