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Finding the Fourth Proportional to 863.89, 1,192.17 and 470.92

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Solution

The fourth proportional to 863.89, 1,192.17 and 470.92 is: 649.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.89 : 1,192.17 = 470.92 : x
  2. Step 2: Convert to fraction form
    863.89/1,192.17 = 470.92/x
  3. Step 3: Cross multiply
    863.89x = 1,192.17 × 470.92
  4. Step 4: Simplify right side
    863.89x = 561,416.70
  5. Step 5: Solve for x
    x = 561,416.70/863.89
  6. Step 6: Final answer
    x = 649.87

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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.