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Finding the Fourth Proportional to 1,219.45, 1,682.74 and 747.15

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Solution

The fourth proportional to 1,219.45, 1,682.74 and 747.15 is: 1,031.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,219.45 : 1,682.74 = 747.15 : x
  2. Step 2: Convert to fraction form
    1,219.45/1,682.74 = 747.15/x
  3. Step 3: Cross multiply
    1,219.45x = 1,682.74 × 747.15
  4. Step 4: Simplify right side
    1,219.45x = 1,257,255.46
  5. Step 5: Solve for x
    x = 1,257,255.46/1,219.45
  6. Step 6: Final answer
    x = 1,031.01

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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.