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Finding the Fourth Proportional to 53.73, 74.12 and 42.81

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Solution

The fourth proportional to 53.73, 74.12 and 42.81 is: 59.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    53.73 : 74.12 = 42.81 : x
  2. Step 2: Convert to fraction form
    53.73/74.12 = 42.81/x
  3. Step 3: Cross multiply
    53.73x = 74.12 × 42.81
  4. Step 4: Simplify right side
    53.73x = 3,172.86
  5. Step 5: Solve for x
    x = 3,172.86/53.73
  6. Step 6: Final answer
    x = 59.05

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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.