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Finding the Fourth Proportional to 863.39, 1,191.48 and 470.42

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Solution

The fourth proportional to 863.39, 1,191.48 and 470.42 is: 649.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.39 : 1,191.48 = 470.42 : x
  2. Step 2: Convert to fraction form
    863.39/1,191.48 = 470.42/x
  3. Step 3: Cross multiply
    863.39x = 1,191.48 × 470.42
  4. Step 4: Simplify right side
    863.39x = 560,490.06
  5. Step 5: Solve for x
    x = 560,490.06/863.39
  6. Step 6: Final answer
    x = 649.18

Related Problems

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Half scale
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Double scale
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Similar ratio
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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.