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Finding the Fourth Proportional to 1,487.63, 2,231.42 and 391.97

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Solution

The fourth proportional to 1,487.63, 2,231.42 and 391.97 is: 587.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,487.63 : 2,231.42 = 391.97 : x
  2. Step 2: Convert to fraction form
    1,487.63/2,231.42 = 391.97/x
  3. Step 3: Cross multiply
    1,487.63x = 2,231.42 × 391.97
  4. Step 4: Simplify right side
    1,487.63x = 874,636.58
  5. Step 5: Solve for x
    x = 874,636.58/1,487.63
  6. Step 6: Final answer
    x = 587.94

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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.