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Finding the Fourth Proportional to 979.15, 1,469.21 and 394.13

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Solution

The fourth proportional to 979.15, 1,469.21 and 394.13 is: 591.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.15 : 1,469.21 = 394.13 : x
  2. Step 2: Convert to fraction form
    979.15/1,469.21 = 394.13/x
  3. Step 3: Cross multiply
    979.15x = 1,469.21 × 394.13
  4. Step 4: Simplify right side
    979.15x = 579,050.42
  5. Step 5: Solve for x
    x = 579,050.42/979.15
  6. Step 6: Final answer
    x = 591.38

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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.