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Finding the Fourth Proportional to 955.48, 1,431.24 and 771.88

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Solution

The fourth proportional to 955.48, 1,431.24 and 771.88 is: 1,156.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    955.48 : 1,431.24 = 771.88 : x
  2. Step 2: Convert to fraction form
    955.48/1,431.24 = 771.88/x
  3. Step 3: Cross multiply
    955.48x = 1,431.24 × 771.88
  4. Step 4: Simplify right side
    955.48x = 1,104,745.53
  5. Step 5: Solve for x
    x = 1,104,745.53/955.48
  6. Step 6: Final answer
    x = 1,156.22

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.