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Finding the Fourth Proportional to 37.80, 51.90 and 31.62

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Solution

The fourth proportional to 37.80, 51.90 and 31.62 is: 43.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    37.80 : 51.90 = 31.62 : x
  2. Step 2: Convert to fraction form
    37.80/51.90 = 31.62/x
  3. Step 3: Cross multiply
    37.80x = 51.90 × 31.62
  4. Step 4: Simplify right side
    37.80x = 1,641.08
  5. Step 5: Solve for x
    x = 1,641.08/37.80
  6. Step 6: Final answer
    x = 43.41

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.