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Finding the Fourth Proportional to 1,439.66, 1,987.07 and 842.43

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Solution

The fourth proportional to 1,439.66, 1,987.07 and 842.43 is: 1,162.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,439.66 : 1,987.07 = 842.43 : x
  2. Step 2: Convert to fraction form
    1,439.66/1,987.07 = 842.43/x
  3. Step 3: Cross multiply
    1,439.66x = 1,987.07 × 842.43
  4. Step 4: Simplify right side
    1,439.66x = 1,673,970.62
  5. Step 5: Solve for x
    x = 1,673,970.62/1,439.66
  6. Step 6: Final answer
    x = 1,162.75

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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.