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Finding the Fourth Proportional to 42.79, 64.11 and 33.76

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Solution

The fourth proportional to 42.79, 64.11 and 33.76 is: 50.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    42.79 : 64.11 = 33.76 : x
  2. Step 2: Convert to fraction form
    42.79/64.11 = 33.76/x
  3. Step 3: Cross multiply
    42.79x = 64.11 × 33.76
  4. Step 4: Simplify right side
    42.79x = 2,164.35
  5. Step 5: Solve for x
    x = 2,164.35/42.79
  6. Step 6: Final answer
    x = 50.58

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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.