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Finding the Fourth Proportional to 67.21, 92.71 and 50.81

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Solution

The fourth proportional to 67.21, 92.71 and 50.81 is: 70.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.21 : 92.71 = 50.81 : x
  2. Step 2: Convert to fraction form
    67.21/92.71 = 50.81/x
  3. Step 3: Cross multiply
    67.21x = 92.71 × 50.81
  4. Step 4: Simplify right side
    67.21x = 4,710.20
  5. Step 5: Solve for x
    x = 4,710.20/67.21
  6. Step 6: Final answer
    x = 70.08

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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.