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Finding the Fourth Proportional to 1,242.48, 1,863.69 and 511.55

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Solution

The fourth proportional to 1,242.48, 1,863.69 and 511.55 is: 767.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,242.48 : 1,863.69 = 511.55 : x
  2. Step 2: Convert to fraction form
    1,242.48/1,863.69 = 511.55/x
  3. Step 3: Cross multiply
    1,242.48x = 1,863.69 × 511.55
  4. Step 4: Simplify right side
    1,242.48x = 953,361.30
  5. Step 5: Solve for x
    x = 953,361.30/1,242.48
  6. Step 6: Final answer
    x = 767.31

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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.