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Finding the Fourth Proportional to 1,013.79, 1,398.31 and 979.92

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Solution

The fourth proportional to 1,013.79, 1,398.31 and 979.92 is: 1,351.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,013.79 : 1,398.31 = 979.92 : x
  2. Step 2: Convert to fraction form
    1,013.79/1,398.31 = 979.92/x
  3. Step 3: Cross multiply
    1,013.79x = 1,398.31 × 979.92
  4. Step 4: Simplify right side
    1,013.79x = 1,370,220.04
  5. Step 5: Solve for x
    x = 1,370,220.04/1,013.79
  6. Step 6: Final answer
    x = 1,351.59

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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.