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Finding the Fourth Proportional to 1,076.49, 1,615.85 and 615.20

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Solution

The fourth proportional to 1,076.49, 1,615.85 and 615.20 is: 923.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,076.49 : 1,615.85 = 615.20 : x
  2. Step 2: Convert to fraction form
    1,076.49/1,615.85 = 615.20/x
  3. Step 3: Cross multiply
    1,076.49x = 1,615.85 × 615.20
  4. Step 4: Simplify right side
    1,076.49x = 994,062.07
  5. Step 5: Solve for x
    x = 994,062.07/1,076.49
  6. Step 6: Final answer
    x = 923.43

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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.