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Finding the Fourth Proportional to 1,219.38, 1,682.79 and 747.18

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Solution

The fourth proportional to 1,219.38, 1,682.79 and 747.18 is: 1,031.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,219.38 : 1,682.79 = 747.18 : x
  2. Step 2: Convert to fraction form
    1,219.38/1,682.79 = 747.18/x
  3. Step 3: Cross multiply
    1,219.38x = 1,682.79 × 747.18
  4. Step 4: Simplify right side
    1,219.38x = 1,257,347.03
  5. Step 5: Solve for x
    x = 1,257,347.03/1,219.38
  6. Step 6: Final answer
    x = 1,031.14

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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.