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Finding the Fourth Proportional to 40, 55.20 and 27.07

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Solution

The fourth proportional to 40, 55.20 and 27.07 is: 37.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    40 : 55.20 = 27.07 : x
  2. Step 2: Convert to fraction form
    40/55.20 = 27.07/x
  3. Step 3: Cross multiply
    40x = 55.20 × 27.07
  4. Step 4: Simplify right side
    40x = 1,494.26
  5. Step 5: Solve for x
    x = 1,494.26/40
  6. Step 6: Final answer
    x = 37.36

Related Problems

Find fourth proportional to 20, 27.60 and 13.54
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Double scale
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Similar ratio
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1.5x scale

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.