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Finding the Fourth Proportional to 863.18, 1,191.20 and 470.23

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Solution

The fourth proportional to 863.18, 1,191.20 and 470.23 is: 648.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.18 : 1,191.20 = 470.23 : x
  2. Step 2: Convert to fraction form
    863.18/1,191.20 = 470.23/x
  3. Step 3: Cross multiply
    863.18x = 1,191.20 × 470.23
  4. Step 4: Simplify right side
    863.18x = 560,137.98
  5. Step 5: Solve for x
    x = 560,137.98/863.18
  6. Step 6: Final answer
    x = 648.92

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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.