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Finding the Fourth Proportional to 961.76, 1,328.06 and 912.56

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Solution

The fourth proportional to 961.76, 1,328.06 and 912.56 is: 1,260.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    961.76 : 1,328.06 = 912.56 : x
  2. Step 2: Convert to fraction form
    961.76/1,328.06 = 912.56/x
  3. Step 3: Cross multiply
    961.76x = 1,328.06 × 912.56
  4. Step 4: Simplify right side
    961.76x = 1,211,930.07
  5. Step 5: Solve for x
    x = 1,211,930.07/961.76
  6. Step 6: Final answer
    x = 1,260.11

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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.