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Finding the Fourth Proportional to 1,302.47, 1,796.78 and 771.21

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Solution

The fourth proportional to 1,302.47, 1,796.78 and 771.21 is: 1,063.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,302.47 : 1,796.78 = 771.21 : x
  2. Step 2: Convert to fraction form
    1,302.47/1,796.78 = 771.21/x
  3. Step 3: Cross multiply
    1,302.47x = 1,796.78 × 771.21
  4. Step 4: Simplify right side
    1,302.47x = 1,385,694.70
  5. Step 5: Solve for x
    x = 1,385,694.70/1,302.47
  6. Step 6: Final answer
    x = 1,063.90

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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.