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Finding the Fourth Proportional to 961.12, 1,440.84 and 815.81

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Solution

The fourth proportional to 961.12, 1,440.84 and 815.81 is: 1,223.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    961.12 : 1,440.84 = 815.81 : x
  2. Step 2: Convert to fraction form
    961.12/1,440.84 = 815.81/x
  3. Step 3: Cross multiply
    961.12x = 1,440.84 × 815.81
  4. Step 4: Simplify right side
    961.12x = 1,175,451.68
  5. Step 5: Solve for x
    x = 1,175,451.68/961.12
  6. Step 6: Final answer
    x = 1,223.00

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.