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Finding the Fourth Proportional to 863.48, 1,191.58 and 470.48

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Solution

The fourth proportional to 863.48, 1,191.58 and 470.48 is: 649.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.48 : 1,191.58 = 470.48 : x
  2. Step 2: Convert to fraction form
    863.48/1,191.58 = 470.48/x
  3. Step 3: Cross multiply
    863.48x = 1,191.58 × 470.48
  4. Step 4: Simplify right side
    863.48x = 560,614.56
  5. Step 5: Solve for x
    x = 560,614.56/863.48
  6. Step 6: Final answer
    x = 649.25

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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.