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Finding the Fourth Proportional to 1,242.92, 1,714.79 and 771.20

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Solution

The fourth proportional to 1,242.92, 1,714.79 and 771.20 is: 1,063.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,242.92 : 1,714.79 = 771.20 : x
  2. Step 2: Convert to fraction form
    1,242.92/1,714.79 = 771.20/x
  3. Step 3: Cross multiply
    1,242.92x = 1,714.79 × 771.20
  4. Step 4: Simplify right side
    1,242.92x = 1,322,433.62
  5. Step 5: Solve for x
    x = 1,322,433.62/1,242.92
  6. Step 6: Final answer
    x = 1,063.98

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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.