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Finding the Fourth Proportional to 979.94, 1,469.88 and 249.50

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Solution

The fourth proportional to 979.94, 1,469.88 and 249.50 is: 374.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.94 : 1,469.88 = 249.50 : x
  2. Step 2: Convert to fraction form
    979.94/1,469.88 = 249.50/x
  3. Step 3: Cross multiply
    979.94x = 1,469.88 × 249.50
  4. Step 4: Simplify right side
    979.94x = 366,735.06
  5. Step 5: Solve for x
    x = 366,735.06/979.94
  6. Step 6: Final answer
    x = 374.24

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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.