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Finding the Fourth Proportional to 863.55, 1,191.66 and 470.56

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Solution

The fourth proportional to 863.55, 1,191.66 and 470.56 is: 649.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.55 : 1,191.66 = 470.56 : x
  2. Step 2: Convert to fraction form
    863.55/1,191.66 = 470.56/x
  3. Step 3: Cross multiply
    863.55x = 1,191.66 × 470.56
  4. Step 4: Simplify right side
    863.55x = 560,747.53
  5. Step 5: Solve for x
    x = 560,747.53/863.55
  6. Step 6: Final answer
    x = 649.35

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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.