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Finding the Fourth Proportional to 53.90, 74.49 and 40.13

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Solution

The fourth proportional to 53.90, 74.49 and 40.13 is: 55.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    53.90 : 74.49 = 40.13 : x
  2. Step 2: Convert to fraction form
    53.90/74.49 = 40.13/x
  3. Step 3: Cross multiply
    53.90x = 74.49 × 40.13
  4. Step 4: Simplify right side
    53.90x = 2,989.28
  5. Step 5: Solve for x
    x = 2,989.28/53.90
  6. Step 6: Final answer
    x = 55.46

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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.