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Finding the Fourth Proportional to 861.79, 1,190.48 and 768.50

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Solution

The fourth proportional to 861.79, 1,190.48 and 768.50 is: 1,061.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    861.79 : 1,190.48 = 768.50 : x
  2. Step 2: Convert to fraction form
    861.79/1,190.48 = 768.50/x
  3. Step 3: Cross multiply
    861.79x = 1,190.48 × 768.50
  4. Step 4: Simplify right side
    861.79x = 914,889.57
  5. Step 5: Solve for x
    x = 914,889.57/861.79
  6. Step 6: Final answer
    x = 1,061.62

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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.