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Finding the Fourth Proportional to 979.57, 1,469.35 and 249.15

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Solution

The fourth proportional to 979.57, 1,469.35 and 249.15 is: 373.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.57 : 1,469.35 = 249.15 : x
  2. Step 2: Convert to fraction form
    979.57/1,469.35 = 249.15/x
  3. Step 3: Cross multiply
    979.57x = 1,469.35 × 249.15
  4. Step 4: Simplify right side
    979.57x = 366,089.54
  5. Step 5: Solve for x
    x = 366,089.54/979.57
  6. Step 6: Final answer
    x = 373.73

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Double scale
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Similar ratio
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1.5x scale

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.