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Finding the Fourth Proportional to 960.58, 1,435.40 and 721.56

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Solution

The fourth proportional to 960.58, 1,435.40 and 721.56 is: 1,078.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    960.58 : 1,435.40 = 721.56 : x
  2. Step 2: Convert to fraction form
    960.58/1,435.40 = 721.56/x
  3. Step 3: Cross multiply
    960.58x = 1,435.40 × 721.56
  4. Step 4: Simplify right side
    960.58x = 1,035,727.22
  5. Step 5: Solve for x
    x = 1,035,727.22/960.58
  6. Step 6: Final answer
    x = 1,078.23

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.