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Finding the Fourth Proportional to 827.79, 1,242.80 and 663.36

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Solution

The fourth proportional to 827.79, 1,242.80 and 663.36 is: 995.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    827.79 : 1,242.80 = 663.36 : x
  2. Step 2: Convert to fraction form
    827.79/1,242.80 = 663.36/x
  3. Step 3: Cross multiply
    827.79x = 1,242.80 × 663.36
  4. Step 4: Simplify right side
    827.79x = 824,420.49
  5. Step 5: Solve for x
    x = 824,420.49/827.79
  6. Step 6: Final answer
    x = 995.93

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.