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Finding the Fourth Proportional to 35.31, 48.80 and 31.30

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Solution

The fourth proportional to 35.31, 48.80 and 31.30 is: 43.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    35.31 : 48.80 = 31.30 : x
  2. Step 2: Convert to fraction form
    35.31/48.80 = 31.30/x
  3. Step 3: Cross multiply
    35.31x = 48.80 × 31.30
  4. Step 4: Simplify right side
    35.31x = 1,527.44
  5. Step 5: Solve for x
    x = 1,527.44/35.31
  6. Step 6: Final answer
    x = 43.26

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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.