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Finding the Fourth Proportional to 32.36, 48.81 and 31.28

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Solution

The fourth proportional to 32.36, 48.81 and 31.28 is: 47.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    32.36 : 48.81 = 31.28 : x
  2. Step 2: Convert to fraction form
    32.36/48.81 = 31.28/x
  3. Step 3: Cross multiply
    32.36x = 48.81 × 31.28
  4. Step 4: Simplify right side
    32.36x = 1,526.78
  5. Step 5: Solve for x
    x = 1,526.78/32.36
  6. Step 6: Final answer
    x = 47.18

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.