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Finding the Fourth Proportional to 53.74, 74.16 and 31.90

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Solution

The fourth proportional to 53.74, 74.16 and 31.90 is: 44.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    53.74 : 74.16 = 31.90 : x
  2. Step 2: Convert to fraction form
    53.74/74.16 = 31.90/x
  3. Step 3: Cross multiply
    53.74x = 74.16 × 31.90
  4. Step 4: Simplify right side
    53.74x = 2,365.70
  5. Step 5: Solve for x
    x = 2,365.70/53.74
  6. Step 6: Final answer
    x = 44.02

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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.