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Finding the Fourth Proportional to 1,118.40, 1,542.30 and 745.39

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Solution

The fourth proportional to 1,118.40, 1,542.30 and 745.39 is: 1,027.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,118.40 : 1,542.30 = 745.39 : x
  2. Step 2: Convert to fraction form
    1,118.40/1,542.30 = 745.39/x
  3. Step 3: Cross multiply
    1,118.40x = 1,542.30 × 745.39
  4. Step 4: Simplify right side
    1,118.40x = 1,149,615.00
  5. Step 5: Solve for x
    x = 1,149,615.00/1,118.40
  6. Step 6: Final answer
    x = 1,027.91

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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.