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Finding the Fourth Proportional to 863.30, 1,191.30 and 490.23

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Solution

The fourth proportional to 863.30, 1,191.30 and 490.23 is: 676.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.30 : 1,191.30 = 490.23 : x
  2. Step 2: Convert to fraction form
    863.30/1,191.30 = 490.23/x
  3. Step 3: Cross multiply
    863.30x = 1,191.30 × 490.23
  4. Step 4: Simplify right side
    863.30x = 584,008.37
  5. Step 5: Solve for x
    x = 584,008.37/863.30
  6. Step 6: Final answer
    x = 676.49

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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.