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Finding the Fourth Proportional to 965.76, 1,324.20 and 872.16

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Solution

The fourth proportional to 965.76, 1,324.20 and 872.16 is: 1,195.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    965.76 : 1,324.20 = 872.16 : x
  2. Step 2: Convert to fraction form
    965.76/1,324.20 = 872.16/x
  3. Step 3: Cross multiply
    965.76x = 1,324.20 × 872.16
  4. Step 4: Simplify right side
    965.76x = 1,154,914.27
  5. Step 5: Solve for x
    x = 1,154,914.27/965.76
  6. Step 6: Final answer
    x = 1,195.86

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.