Home / 1,439.20-2,157.72-745.48

Finding the Fourth Proportional to 1,439.20, 2,157.72 and 745.48

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Solution

The fourth proportional to 1,439.20, 2,157.72 and 745.48 is: 1,117.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,439.20 : 2,157.72 = 745.48 : x
  2. Step 2: Convert to fraction form
    1,439.20/2,157.72 = 745.48/x
  3. Step 3: Cross multiply
    1,439.20x = 2,157.72 × 745.48
  4. Step 4: Simplify right side
    1,439.20x = 1,608,537.11
  5. Step 5: Solve for x
    x = 1,608,537.11/1,439.20
  6. Step 6: Final answer
    x = 1,117.66

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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.