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Finding the Fourth Proportional to 51.70, 71.36 and 29.87

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Solution

The fourth proportional to 51.70, 71.36 and 29.87 is: 41.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    51.70 : 71.36 = 29.87 : x
  2. Step 2: Convert to fraction form
    51.70/71.36 = 29.87/x
  3. Step 3: Cross multiply
    51.70x = 71.36 × 29.87
  4. Step 4: Simplify right side
    51.70x = 2,131.55
  5. Step 5: Solve for x
    x = 2,131.55/51.70
  6. Step 6: Final answer
    x = 41.23

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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.