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Finding the Fourth Proportional to 960.55, 1,442.00 and 912.13

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Solution

The fourth proportional to 960.55, 1,442.00 and 912.13 is: 1,369.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    960.55 : 1,442.00 = 912.13 : x
  2. Step 2: Convert to fraction form
    960.55/1,442.00 = 912.13/x
  3. Step 3: Cross multiply
    960.55x = 1,442.00 × 912.13
  4. Step 4: Simplify right side
    960.55x = 1,315,290.14
  5. Step 5: Solve for x
    x = 1,315,290.14/960.55
  6. Step 6: Final answer
    x = 1,369.31

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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.