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Finding the Fourth Proportional to 27.36, 40.74 and 27.20

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Solution

The fourth proportional to 27.36, 40.74 and 27.20 is: 40.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    27.36 : 40.74 = 27.20 : x
  2. Step 2: Convert to fraction form
    27.36/40.74 = 27.20/x
  3. Step 3: Cross multiply
    27.36x = 40.74 × 27.20
  4. Step 4: Simplify right side
    27.36x = 1,108.13
  5. Step 5: Solve for x
    x = 1,108.13/27.36
  6. Step 6: Final answer
    x = 40.50

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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.