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Finding the Fourth Proportional to 1,242, 1,862.40 and 511.44

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Solution

The fourth proportional to 1,242, 1,862.40 and 511.44 is: 766.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,242 : 1,862.40 = 511.44 : x
  2. Step 2: Convert to fraction form
    1,242/1,862.40 = 511.44/x
  3. Step 3: Cross multiply
    1,242x = 1,862.40 × 511.44
  4. Step 4: Simplify right side
    1,242x = 952,505.86
  5. Step 5: Solve for x
    x = 952,505.86/1,242
  6. Step 6: Final answer
    x = 766.91

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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.