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Finding the Fourth Proportional to 30.22, 41.71 and 28.76

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Solution

The fourth proportional to 30.22, 41.71 and 28.76 is: 39.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    30.22 : 41.71 = 28.76 : x
  2. Step 2: Convert to fraction form
    30.22/41.71 = 28.76/x
  3. Step 3: Cross multiply
    30.22x = 41.71 × 28.76
  4. Step 4: Simplify right side
    30.22x = 1,199.61
  5. Step 5: Solve for x
    x = 1,199.61/30.22
  6. Step 6: Final answer
    x = 39.70

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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.