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Finding the Fourth Proportional to 32.58, 45 and 20.31

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Solution

The fourth proportional to 32.58, 45 and 20.31 is: 28.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    32.58 : 45 = 20.31 : x
  2. Step 2: Convert to fraction form
    32.58/45 = 20.31/x
  3. Step 3: Cross multiply
    32.58x = 45 × 20.31
  4. Step 4: Simplify right side
    32.58x = 913.95
  5. Step 5: Solve for x
    x = 913.95/32.58
  6. Step 6: Final answer
    x = 28.05

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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.