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Finding the Fourth Proportional to 979.88, 1,469.88 and 394.79

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Solution

The fourth proportional to 979.88, 1,469.88 and 394.79 is: 592.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.88 : 1,469.88 = 394.79 : x
  2. Step 2: Convert to fraction form
    979.88/1,469.88 = 394.79/x
  3. Step 3: Cross multiply
    979.88x = 1,469.88 × 394.79
  4. Step 4: Simplify right side
    979.88x = 580,291.95
  5. Step 5: Solve for x
    x = 580,291.95/979.88
  6. Step 6: Final answer
    x = 592.21

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.