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Finding the Fourth Proportional to 956.62, 1,320.42 and 661.60

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Solution

The fourth proportional to 956.62, 1,320.42 and 661.60 is: 913.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    956.62 : 1,320.42 = 661.60 : x
  2. Step 2: Convert to fraction form
    956.62/1,320.42 = 661.60/x
  3. Step 3: Cross multiply
    956.62x = 1,320.42 × 661.60
  4. Step 4: Simplify right side
    956.62x = 873,589.87
  5. Step 5: Solve for x
    x = 873,589.87/956.62
  6. Step 6: Final answer
    x = 913.20

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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.