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Finding the Fourth Proportional to 51.05, 70.46 and 31.65

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Solution

The fourth proportional to 51.05, 70.46 and 31.65 is: 43.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    51.05 : 70.46 = 31.65 : x
  2. Step 2: Convert to fraction form
    51.05/70.46 = 31.65/x
  3. Step 3: Cross multiply
    51.05x = 70.46 × 31.65
  4. Step 4: Simplify right side
    51.05x = 2,229.76
  5. Step 5: Solve for x
    x = 2,229.76/51.05
  6. Step 6: Final answer
    x = 43.68

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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.