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Finding the Fourth Proportional to 74.17, 102.45 and 55.81

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Solution

The fourth proportional to 74.17, 102.45 and 55.81 is: 77.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.17 : 102.45 = 55.81 : x
  2. Step 2: Convert to fraction form
    74.17/102.45 = 55.81/x
  3. Step 3: Cross multiply
    74.17x = 102.45 × 55.81
  4. Step 4: Simplify right side
    74.17x = 5,717.73
  5. Step 5: Solve for x
    x = 5,717.73/74.17
  6. Step 6: Final answer
    x = 77.09

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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.