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Finding the Fourth Proportional to 891, 1,230.06 and 615.48

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Solution

The fourth proportional to 891, 1,230.06 and 615.48 is: 849.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    891 : 1,230.06 = 615.48 : x
  2. Step 2: Convert to fraction form
    891/1,230.06 = 615.48/x
  3. Step 3: Cross multiply
    891x = 1,230.06 × 615.48
  4. Step 4: Simplify right side
    891x = 757,077.33
  5. Step 5: Solve for x
    x = 757,077.33/891
  6. Step 6: Final answer
    x = 849.69

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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.