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Finding the Fourth Proportional to 51.34, 70.85 and 28.34

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Solution

The fourth proportional to 51.34, 70.85 and 28.34 is: 39.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    51.34 : 70.85 = 28.34 : x
  2. Step 2: Convert to fraction form
    51.34/70.85 = 28.34/x
  3. Step 3: Cross multiply
    51.34x = 70.85 × 28.34
  4. Step 4: Simplify right side
    51.34x = 2,007.89
  5. Step 5: Solve for x
    x = 2,007.89/51.34
  6. Step 6: Final answer
    x = 39.11

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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.