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Finding the Fourth Proportional to 39.95, 54.95 and 32.90

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Solution

The fourth proportional to 39.95, 54.95 and 32.90 is: 45.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    39.95 : 54.95 = 32.90 : x
  2. Step 2: Convert to fraction form
    39.95/54.95 = 32.90/x
  3. Step 3: Cross multiply
    39.95x = 54.95 × 32.90
  4. Step 4: Simplify right side
    39.95x = 1,807.42
  5. Step 5: Solve for x
    x = 1,807.42/39.95
  6. Step 6: Final answer
    x = 45.25

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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.