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Finding the Fourth Proportional to 960.80, 1,438.70 and 520.38

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Solution

The fourth proportional to 960.80, 1,438.70 and 520.38 is: 779.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    960.80 : 1,438.70 = 520.38 : x
  2. Step 2: Convert to fraction form
    960.80/1,438.70 = 520.38/x
  3. Step 3: Cross multiply
    960.80x = 1,438.70 × 520.38
  4. Step 4: Simplify right side
    960.80x = 748,668.10
  5. Step 5: Solve for x
    x = 748,668.10/960.80
  6. Step 6: Final answer
    x = 779.22

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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.