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Finding the Fourth Proportional to 965.50, 1,332.78 and 611.93

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Solution

The fourth proportional to 965.50, 1,332.78 and 611.93 is: 844.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    965.50 : 1,332.78 = 611.93 : x
  2. Step 2: Convert to fraction form
    965.50/1,332.78 = 611.93/x
  3. Step 3: Cross multiply
    965.50x = 1,332.78 × 611.93
  4. Step 4: Simplify right side
    965.50x = 815,568.07
  5. Step 5: Solve for x
    x = 815,568.07/965.50
  6. Step 6: Final answer
    x = 844.71

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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.