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Finding the Fourth Proportional to 40.74, 60.78 and 36.18

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Solution

The fourth proportional to 40.74, 60.78 and 36.18 is: 53.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    40.74 : 60.78 = 36.18 : x
  2. Step 2: Convert to fraction form
    40.74/60.78 = 36.18/x
  3. Step 3: Cross multiply
    40.74x = 60.78 × 36.18
  4. Step 4: Simplify right side
    40.74x = 2,199.02
  5. Step 5: Solve for x
    x = 2,199.02/40.74
  6. Step 6: Final answer
    x = 53.98

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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.