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Finding the Fourth Proportional to 965.79, 1,328.81 and 865.76

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Solution

The fourth proportional to 965.79, 1,328.81 and 865.76 is: 1,191.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    965.79 : 1,328.81 = 865.76 : x
  2. Step 2: Convert to fraction form
    965.79/1,328.81 = 865.76/x
  3. Step 3: Cross multiply
    965.79x = 1,328.81 × 865.76
  4. Step 4: Simplify right side
    965.79x = 1,150,419.57
  5. Step 5: Solve for x
    x = 1,150,419.57/965.79
  6. Step 6: Final answer
    x = 1,191.17

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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.