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Finding the Fourth Proportional to 1,317.22, 1,976.10 and 439.68

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Solution

The fourth proportional to 1,317.22, 1,976.10 and 439.68 is: 659.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,317.22 : 1,976.10 = 439.68 : x
  2. Step 2: Convert to fraction form
    1,317.22/1,976.10 = 439.68/x
  3. Step 3: Cross multiply
    1,317.22x = 1,976.10 × 439.68
  4. Step 4: Simplify right side
    1,317.22x = 868,851.65
  5. Step 5: Solve for x
    x = 868,851.65/1,317.22
  6. Step 6: Final answer
    x = 659.61

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Half scale
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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.