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Finding the Fourth Proportional to 960.84, 1,324.62 and 645.55

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Solution

The fourth proportional to 960.84, 1,324.62 and 645.55 is: 889.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    960.84 : 1,324.62 = 645.55 : x
  2. Step 2: Convert to fraction form
    960.84/1,324.62 = 645.55/x
  3. Step 3: Cross multiply
    960.84x = 1,324.62 × 645.55
  4. Step 4: Simplify right side
    960.84x = 855,108.44
  5. Step 5: Solve for x
    x = 855,108.44/960.84
  6. Step 6: Final answer
    x = 889.96

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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.