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Finding the Fourth Proportional to 913.20, 1,259.75 and 691.77

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Solution

The fourth proportional to 913.20, 1,259.75 and 691.77 is: 954.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.20 : 1,259.75 = 691.77 : x
  2. Step 2: Convert to fraction form
    913.20/1,259.75 = 691.77/x
  3. Step 3: Cross multiply
    913.20x = 1,259.75 × 691.77
  4. Step 4: Simplify right side
    913.20x = 871,453.80
  5. Step 5: Solve for x
    x = 871,453.80/913.20
  6. Step 6: Final answer
    x = 954.29

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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.