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Finding the Fourth Proportional to 955.50, 1,317.87 and 661.26

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Solution

The fourth proportional to 955.50, 1,317.87 and 661.26 is: 912.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    955.50 : 1,317.87 = 661.26 : x
  2. Step 2: Convert to fraction form
    955.50/1,317.87 = 661.26/x
  3. Step 3: Cross multiply
    955.50x = 1,317.87 × 661.26
  4. Step 4: Simplify right side
    955.50x = 871,454.72
  5. Step 5: Solve for x
    x = 871,454.72/955.50
  6. Step 6: Final answer
    x = 912.04

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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.