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Finding the Fourth Proportional to 53.87, 81.14 and 42.53

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Solution

The fourth proportional to 53.87, 81.14 and 42.53 is: 64.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    53.87 : 81.14 = 42.53 : x
  2. Step 2: Convert to fraction form
    53.87/81.14 = 42.53/x
  3. Step 3: Cross multiply
    53.87x = 81.14 × 42.53
  4. Step 4: Simplify right side
    53.87x = 3,450.27
  5. Step 5: Solve for x
    x = 3,450.27/53.87
  6. Step 6: Final answer
    x = 64.05

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.