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Finding the Fourth Proportional to 74.53, 102.81 and 58.15

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Solution

The fourth proportional to 74.53, 102.81 and 58.15 is: 80.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.53 : 102.81 = 58.15 : x
  2. Step 2: Convert to fraction form
    74.53/102.81 = 58.15/x
  3. Step 3: Cross multiply
    74.53x = 102.81 × 58.15
  4. Step 4: Simplify right side
    74.53x = 5,978.40
  5. Step 5: Solve for x
    x = 5,978.40/74.53
  6. Step 6: Final answer
    x = 80.21

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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.