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Finding the Fourth Proportional to 955.89, 1,318.95 and 661.05

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Solution

The fourth proportional to 955.89, 1,318.95 and 661.05 is: 912.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    955.89 : 1,318.95 = 661.05 : x
  2. Step 2: Convert to fraction form
    955.89/1,318.95 = 661.05/x
  3. Step 3: Cross multiply
    955.89x = 1,318.95 × 661.05
  4. Step 4: Simplify right side
    955.89x = 871,891.90
  5. Step 5: Solve for x
    x = 871,891.90/955.89
  6. Step 6: Final answer
    x = 912.13

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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.