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Finding the Fourth Proportional to 675.90, 1,012.65 and 579.90

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Solution

The fourth proportional to 675.90, 1,012.65 and 579.90 is: 868.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    675.90 : 1,012.65 = 579.90 : x
  2. Step 2: Convert to fraction form
    675.90/1,012.65 = 579.90/x
  3. Step 3: Cross multiply
    675.90x = 1,012.65 × 579.90
  4. Step 4: Simplify right side
    675.90x = 587,235.74
  5. Step 5: Solve for x
    x = 587,235.74/675.90
  6. Step 6: Final answer
    x = 868.82

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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.