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Finding the Fourth Proportional to 680.52, 1,018.62 and 487.56

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Solution

The fourth proportional to 680.52, 1,018.62 and 487.56 is: 729.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.52 : 1,018.62 = 487.56 : x
  2. Step 2: Convert to fraction form
    680.52/1,018.62 = 487.56/x
  3. Step 3: Cross multiply
    680.52x = 1,018.62 × 487.56
  4. Step 4: Simplify right side
    680.52x = 496,638.37
  5. Step 5: Solve for x
    x = 496,638.37/680.52
  6. Step 6: Final answer
    x = 729.79

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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.