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Finding the Fourth Proportional to 955.76, 1,318.40 and 747.28

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Solution

The fourth proportional to 955.76, 1,318.40 and 747.28 is: 1,030.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    955.76 : 1,318.40 = 747.28 : x
  2. Step 2: Convert to fraction form
    955.76/1,318.40 = 747.28/x
  3. Step 3: Cross multiply
    955.76x = 1,318.40 × 747.28
  4. Step 4: Simplify right side
    955.76x = 985,213.95
  5. Step 5: Solve for x
    x = 985,213.95/955.76
  6. Step 6: Final answer
    x = 1,030.82

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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.