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Finding the Fourth Proportional to 986.12, 1,479.05 and 255.69

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Solution

The fourth proportional to 986.12, 1,479.05 and 255.69 is: 383.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.12 : 1,479.05 = 255.69 : x
  2. Step 2: Convert to fraction form
    986.12/1,479.05 = 255.69/x
  3. Step 3: Cross multiply
    986.12x = 1,479.05 × 255.69
  4. Step 4: Simplify right side
    986.12x = 378,177.02
  5. Step 5: Solve for x
    x = 378,177.02/986.12
  6. Step 6: Final answer
    x = 383.50

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Half scale
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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.