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Finding the Fourth Proportional to 979.49, 1,351.33 and 625.43

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Solution

The fourth proportional to 979.49, 1,351.33 and 625.43 is: 862.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.49 : 1,351.33 = 625.43 : x
  2. Step 2: Convert to fraction form
    979.49/1,351.33 = 625.43/x
  3. Step 3: Cross multiply
    979.49x = 1,351.33 × 625.43
  4. Step 4: Simplify right side
    979.49x = 845,155.82
  5. Step 5: Solve for x
    x = 845,155.82/979.49
  6. Step 6: Final answer
    x = 862.85

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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.