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Finding the Fourth Proportional to 955.42, 1,317.92 and 851.74

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Solution

The fourth proportional to 955.42, 1,317.92 and 851.74 is: 1,174.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    955.42 : 1,317.92 = 851.74 : x
  2. Step 2: Convert to fraction form
    955.42/1,317.92 = 851.74/x
  3. Step 3: Cross multiply
    955.42x = 1,317.92 × 851.74
  4. Step 4: Simplify right side
    955.42x = 1,122,525.18
  5. Step 5: Solve for x
    x = 1,122,525.18/955.42
  6. Step 6: Final answer
    x = 1,174.90

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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.