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Finding the Fourth Proportional to 773.82, 1,155.92 and 657.72

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Solution

The fourth proportional to 773.82, 1,155.92 and 657.72 is: 982.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    773.82 : 1,155.92 = 657.72 : x
  2. Step 2: Convert to fraction form
    773.82/1,155.92 = 657.72/x
  3. Step 3: Cross multiply
    773.82x = 1,155.92 × 657.72
  4. Step 4: Simplify right side
    773.82x = 760,268.41
  5. Step 5: Solve for x
    x = 760,268.41/773.82
  6. Step 6: Final answer
    x = 982.49

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.