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Finding the Fourth Proportional to 1,487.80, 2,231.72 and 392.27

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Solution

The fourth proportional to 1,487.80, 2,231.72 and 392.27 is: 588.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,487.80 : 2,231.72 = 392.27 : x
  2. Step 2: Convert to fraction form
    1,487.80/2,231.72 = 392.27/x
  3. Step 3: Cross multiply
    1,487.80x = 2,231.72 × 392.27
  4. Step 4: Simplify right side
    1,487.80x = 875,434.84
  5. Step 5: Solve for x
    x = 875,434.84/1,487.80
  6. Step 6: Final answer
    x = 588.41

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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.