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Finding the Fourth Proportional to 1,487.84, 2,231.79 and 392.22

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Solution

The fourth proportional to 1,487.84, 2,231.79 and 392.22 is: 588.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,487.84 : 2,231.79 = 392.22 : x
  2. Step 2: Convert to fraction form
    1,487.84/2,231.79 = 392.22/x
  3. Step 3: Cross multiply
    1,487.84x = 2,231.79 × 392.22
  4. Step 4: Simplify right side
    1,487.84x = 875,352.67
  5. Step 5: Solve for x
    x = 875,352.67/1,487.84
  6. Step 6: Final answer
    x = 588.34

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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.