Home / 1,321.60-1,982.40-397.07

Finding the Fourth Proportional to 1,321.60, 1,982.40 and 397.07

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Solution

The fourth proportional to 1,321.60, 1,982.40 and 397.07 is: 595.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,321.60 : 1,982.40 = 397.07 : x
  2. Step 2: Convert to fraction form
    1,321.60/1,982.40 = 397.07/x
  3. Step 3: Cross multiply
    1,321.60x = 1,982.40 × 397.07
  4. Step 4: Simplify right side
    1,321.60x = 787,151.57
  5. Step 5: Solve for x
    x = 787,151.57/1,321.60
  6. Step 6: Final answer
    x = 595.61

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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.