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Finding the Fourth Proportional to 863.49, 1,191.61 and 480.20

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Solution

The fourth proportional to 863.49, 1,191.61 and 480.20 is: 662.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.49 : 1,191.61 = 480.20 : x
  2. Step 2: Convert to fraction form
    863.49/1,191.61 = 480.20/x
  3. Step 3: Cross multiply
    863.49x = 1,191.61 × 480.20
  4. Step 4: Simplify right side
    863.49x = 572,215.82
  5. Step 5: Solve for x
    x = 572,215.82/863.49
  6. Step 6: Final answer
    x = 662.68

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.