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Finding the Fourth Proportional to 45.31, 67.64 and 39.20

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Solution

The fourth proportional to 45.31, 67.64 and 39.20 is: 58.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    45.31 : 67.64 = 39.20 : x
  2. Step 2: Convert to fraction form
    45.31/67.64 = 39.20/x
  3. Step 3: Cross multiply
    45.31x = 67.64 × 39.20
  4. Step 4: Simplify right side
    45.31x = 2,651.76
  5. Step 5: Solve for x
    x = 2,651.76/45.31
  6. Step 6: Final answer
    x = 58.53

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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.