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Finding the Fourth Proportional to 53.95, 74.46 and 40.15

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Solution

The fourth proportional to 53.95, 74.46 and 40.15 is: 55.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    53.95 : 74.46 = 40.15 : x
  2. Step 2: Convert to fraction form
    53.95/74.46 = 40.15/x
  3. Step 3: Cross multiply
    53.95x = 74.46 × 40.15
  4. Step 4: Simplify right side
    53.95x = 2,989.57
  5. Step 5: Solve for x
    x = 2,989.57/53.95
  6. Step 6: Final answer
    x = 55.41

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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.