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Finding the Fourth Proportional to 45.12, 62.31 and 31.28

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Solution

The fourth proportional to 45.12, 62.31 and 31.28 is: 43.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    45.12 : 62.31 = 31.28 : x
  2. Step 2: Convert to fraction form
    45.12/62.31 = 31.28/x
  3. Step 3: Cross multiply
    45.12x = 62.31 × 31.28
  4. Step 4: Simplify right side
    45.12x = 1,949.21
  5. Step 5: Solve for x
    x = 1,949.21/45.12
  6. Step 6: Final answer
    x = 43.20

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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.