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Finding the Fourth Proportional to 51.42, 70.99 and 49.22

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Solution

The fourth proportional to 51.42, 70.99 and 49.22 is: 67.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    51.42 : 70.99 = 49.22 : x
  2. Step 2: Convert to fraction form
    51.42/70.99 = 49.22/x
  3. Step 3: Cross multiply
    51.42x = 70.99 × 49.22
  4. Step 4: Simplify right side
    51.42x = 3,494.13
  5. Step 5: Solve for x
    x = 3,494.13/51.42
  6. Step 6: Final answer
    x = 67.95

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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.