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Finding the Fourth Proportional to 863.88, 1,192.15 and 470.90

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Solution

The fourth proportional to 863.88, 1,192.15 and 470.90 is: 649.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.88 : 1,192.15 = 470.90 : x
  2. Step 2: Convert to fraction form
    863.88/1,192.15 = 470.90/x
  3. Step 3: Cross multiply
    863.88x = 1,192.15 × 470.90
  4. Step 4: Simplify right side
    863.88x = 561,376.30
  5. Step 5: Solve for x
    x = 561,376.30/863.88
  6. Step 6: Final answer
    x = 649.83

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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.