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Finding the Fourth Proportional to 53.91, 74.40 and 39.92

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Solution

The fourth proportional to 53.91, 74.40 and 39.92 is: 55.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    53.91 : 74.40 = 39.92 : x
  2. Step 2: Convert to fraction form
    53.91/74.40 = 39.92/x
  3. Step 3: Cross multiply
    53.91x = 74.40 × 39.92
  4. Step 4: Simplify right side
    53.91x = 2,969.68
  5. Step 5: Solve for x
    x = 2,969.68/53.91
  6. Step 6: Final answer
    x = 55.09

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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.