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Finding the Fourth Proportional to 40.53, 56 and 39.12

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Solution

The fourth proportional to 40.53, 56 and 39.12 is: 54.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    40.53 : 56 = 39.12 : x
  2. Step 2: Convert to fraction form
    40.53/56 = 39.12/x
  3. Step 3: Cross multiply
    40.53x = 56 × 39.12
  4. Step 4: Simplify right side
    40.53x = 2,190.72
  5. Step 5: Solve for x
    x = 2,190.72/40.53
  6. Step 6: Final answer
    x = 54.05

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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.