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Finding the Fourth Proportional to 675.78, 1,013.98 and 664.86

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Solution

The fourth proportional to 675.78, 1,013.98 and 664.86 is: 997.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    675.78 : 1,013.98 = 664.86 : x
  2. Step 2: Convert to fraction form
    675.78/1,013.98 = 664.86/x
  3. Step 3: Cross multiply
    675.78x = 1,013.98 × 664.86
  4. Step 4: Simplify right side
    675.78x = 674,154.74
  5. Step 5: Solve for x
    x = 674,154.74/675.78
  6. Step 6: Final answer
    x = 997.59

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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.