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Finding the Fourth Proportional to 863.52, 1,191.68 and 470.57

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Solution

The fourth proportional to 863.52, 1,191.68 and 470.57 is: 649.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.52 : 1,191.68 = 470.57 : x
  2. Step 2: Convert to fraction form
    863.52/1,191.68 = 470.57/x
  3. Step 3: Cross multiply
    863.52x = 1,191.68 × 470.57
  4. Step 4: Simplify right side
    863.52x = 560,768.86
  5. Step 5: Solve for x
    x = 560,768.86/863.52
  6. Step 6: Final answer
    x = 649.40

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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.