Home / 1,439.72-1,987.14-1,206.44

Finding the Fourth Proportional to 1,439.72, 1,987.14 and 1,206.44

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Solution

The fourth proportional to 1,439.72, 1,987.14 and 1,206.44 is: 1,665.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,439.72 : 1,987.14 = 1,206.44 : x
  2. Step 2: Convert to fraction form
    1,439.72/1,987.14 = 1,206.44/x
  3. Step 3: Cross multiply
    1,439.72x = 1,987.14 × 1,206.44
  4. Step 4: Simplify right side
    1,439.72x = 2,397,365.18
  5. Step 5: Solve for x
    x = 2,397,365.18/1,439.72
  6. Step 6: Final answer
    x = 1,665.16

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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.