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Finding the Fourth Proportional to 960.64, 1,325.90 and 680.58

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Solution

The fourth proportional to 960.64, 1,325.90 and 680.58 is: 939.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    960.64 : 1,325.90 = 680.58 : x
  2. Step 2: Convert to fraction form
    960.64/1,325.90 = 680.58/x
  3. Step 3: Cross multiply
    960.64x = 1,325.90 × 680.58
  4. Step 4: Simplify right side
    960.64x = 902,381.02
  5. Step 5: Solve for x
    x = 902,381.02/960.64
  6. Step 6: Final answer
    x = 939.35

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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.