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Finding the Fourth Proportional to 387.70, 535 and 221.92

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Solution

The fourth proportional to 387.70, 535 and 221.92 is: 306.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.70 : 535 = 221.92 : x
  2. Step 2: Convert to fraction form
    387.70/535 = 221.92/x
  3. Step 3: Cross multiply
    387.70x = 535 × 221.92
  4. Step 4: Simplify right side
    387.70x = 118,727.20
  5. Step 5: Solve for x
    x = 118,727.20/387.70
  6. Step 6: Final answer
    x = 306.23

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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.