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Finding the Fourth Proportional to 986.30, 1,479.47 and 255.89

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Solution

The fourth proportional to 986.30, 1,479.47 and 255.89 is: 383.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.30 : 1,479.47 = 255.89 : x
  2. Step 2: Convert to fraction form
    986.30/1,479.47 = 255.89/x
  3. Step 3: Cross multiply
    986.30x = 1,479.47 × 255.89
  4. Step 4: Simplify right side
    986.30x = 378,572.90
  5. Step 5: Solve for x
    x = 378,572.90/986.30
  6. Step 6: Final answer
    x = 383.83

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Double scale
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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.