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Finding the Fourth Proportional to 938.80, 1,295.22 and 717.40

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Solution

The fourth proportional to 938.80, 1,295.22 and 717.40 is: 989.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    938.80 : 1,295.22 = 717.40 : x
  2. Step 2: Convert to fraction form
    938.80/1,295.22 = 717.40/x
  3. Step 3: Cross multiply
    938.80x = 1,295.22 × 717.40
  4. Step 4: Simplify right side
    938.80x = 929,190.83
  5. Step 5: Solve for x
    x = 929,190.83/938.80
  6. Step 6: Final answer
    x = 989.76

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.