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Finding the Fourth Proportional to 961.64, 1,325.22 and 685.16

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Solution

The fourth proportional to 961.64, 1,325.22 and 685.16 is: 944.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    961.64 : 1,325.22 = 685.16 : x
  2. Step 2: Convert to fraction form
    961.64/1,325.22 = 685.16/x
  3. Step 3: Cross multiply
    961.64x = 1,325.22 × 685.16
  4. Step 4: Simplify right side
    961.64x = 907,987.74
  5. Step 5: Solve for x
    x = 907,987.74/961.64
  6. Step 6: Final answer
    x = 944.21

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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.