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Finding the Fourth Proportional to 680.90, 1,021.35 and 247.88

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Solution

The fourth proportional to 680.90, 1,021.35 and 247.88 is: 371.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.90 : 1,021.35 = 247.88 : x
  2. Step 2: Convert to fraction form
    680.90/1,021.35 = 247.88/x
  3. Step 3: Cross multiply
    680.90x = 1,021.35 × 247.88
  4. Step 4: Simplify right side
    680.90x = 253,172.24
  5. Step 5: Solve for x
    x = 253,172.24/680.90
  6. Step 6: Final answer
    x = 371.82

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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.