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Finding the Fourth Proportional to 961.36, 1,431.68 and 940.86

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Solution

The fourth proportional to 961.36, 1,431.68 and 940.86 is: 1,401.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    961.36 : 1,431.68 = 940.86 : x
  2. Step 2: Convert to fraction form
    961.36/1,431.68 = 940.86/x
  3. Step 3: Cross multiply
    961.36x = 1,431.68 × 940.86
  4. Step 4: Simplify right side
    961.36x = 1,347,005.74
  5. Step 5: Solve for x
    x = 1,347,005.74/961.36
  6. Step 6: Final answer
    x = 1,401.15

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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.