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Finding the Fourth Proportional to 979.23, 1,469.43 and 394.28

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Solution

The fourth proportional to 979.23, 1,469.43 and 394.28 is: 591.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.23 : 1,469.43 = 394.28 : x
  2. Step 2: Convert to fraction form
    979.23/1,469.43 = 394.28/x
  3. Step 3: Cross multiply
    979.23x = 1,469.43 × 394.28
  4. Step 4: Simplify right side
    979.23x = 579,370.53
  5. Step 5: Solve for x
    x = 579,370.53/979.23
  6. Step 6: Final answer
    x = 591.66

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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.