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Finding the Fourth Proportional to 32.81, 48.90 and 31.07

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Solution

The fourth proportional to 32.81, 48.90 and 31.07 is: 46.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    32.81 : 48.90 = 31.07 : x
  2. Step 2: Convert to fraction form
    32.81/48.90 = 31.07/x
  3. Step 3: Cross multiply
    32.81x = 48.90 × 31.07
  4. Step 4: Simplify right side
    32.81x = 1,519.32
  5. Step 5: Solve for x
    x = 1,519.32/32.81
  6. Step 6: Final answer
    x = 46.31

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.