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Finding the Fourth Proportional to 35.30, 48.80 and 31.66

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Solution

The fourth proportional to 35.30, 48.80 and 31.66 is: 43.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    35.30 : 48.80 = 31.66 : x
  2. Step 2: Convert to fraction form
    35.30/48.80 = 31.66/x
  3. Step 3: Cross multiply
    35.30x = 48.80 × 31.66
  4. Step 4: Simplify right side
    35.30x = 1,544.97
  5. Step 5: Solve for x
    x = 1,544.97/35.30
  6. Step 6: Final answer
    x = 43.76

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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.