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Finding the Fourth Proportional to 1,042.49, 1,564.80 and 813.92

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Solution

The fourth proportional to 1,042.49, 1,564.80 and 813.92 is: 1,221.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,042.49 : 1,564.80 = 813.92 : x
  2. Step 2: Convert to fraction form
    1,042.49/1,564.80 = 813.92/x
  3. Step 3: Cross multiply
    1,042.49x = 1,564.80 × 813.92
  4. Step 4: Simplify right side
    1,042.49x = 1,273,615.72
  5. Step 5: Solve for x
    x = 1,273,615.72/1,042.49
  6. Step 6: Final answer
    x = 1,221.71

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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.