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Finding the Fourth Proportional to 863.48, 1,191.40 and 490.38

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Solution

The fourth proportional to 863.48, 1,191.40 and 490.38 is: 676.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.48 : 1,191.40 = 490.38 : x
  2. Step 2: Convert to fraction form
    863.48/1,191.40 = 490.38/x
  3. Step 3: Cross multiply
    863.48x = 1,191.40 × 490.38
  4. Step 4: Simplify right side
    863.48x = 584,232.78
  5. Step 5: Solve for x
    x = 584,232.78/863.48
  6. Step 6: Final answer
    x = 676.60

Related Problems

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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 (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.