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Finding the Fourth Proportional to 965.71, 1,330.89 and 685.96

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Solution

The fourth proportional to 965.71, 1,330.89 and 685.96 is: 945.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    965.71 : 1,330.89 = 685.96 : x
  2. Step 2: Convert to fraction form
    965.71/1,330.89 = 685.96/x
  3. Step 3: Cross multiply
    965.71x = 1,330.89 × 685.96
  4. Step 4: Simplify right side
    965.71x = 912,937.30
  5. Step 5: Solve for x
    x = 912,937.30/965.71
  6. Step 6: Final answer
    x = 945.35

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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.