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Finding the Fourth Proportional to 959.74, 1,439.64 and 717.80

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Solution

The fourth proportional to 959.74, 1,439.64 and 717.80 is: 1,076.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    959.74 : 1,439.64 = 717.80 : x
  2. Step 2: Convert to fraction form
    959.74/1,439.64 = 717.80/x
  3. Step 3: Cross multiply
    959.74x = 1,439.64 × 717.80
  4. Step 4: Simplify right side
    959.74x = 1,033,375.40
  5. Step 5: Solve for x
    x = 1,033,375.40/959.74
  6. Step 6: Final answer
    x = 1,076.72

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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.