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Finding the Fourth Proportional to 387.76, 535.06 and 221.95

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Solution

The fourth proportional to 387.76, 535.06 and 221.95 is: 306.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.76 : 535.06 = 221.95 : x
  2. Step 2: Convert to fraction form
    387.76/535.06 = 221.95/x
  3. Step 3: Cross multiply
    387.76x = 535.06 × 221.95
  4. Step 4: Simplify right side
    387.76x = 118,756.57
  5. Step 5: Solve for x
    x = 118,756.57/387.76
  6. Step 6: Final answer
    x = 306.26

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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.