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Finding the Fourth Proportional to 74.31, 102.78 and 66.53

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Solution

The fourth proportional to 74.31, 102.78 and 66.53 is: 92.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.31 : 102.78 = 66.53 : x
  2. Step 2: Convert to fraction form
    74.31/102.78 = 66.53/x
  3. Step 3: Cross multiply
    74.31x = 102.78 × 66.53
  4. Step 4: Simplify right side
    74.31x = 6,837.11
  5. Step 5: Solve for x
    x = 6,837.11/74.31
  6. Step 6: Final answer
    x = 92.01

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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.