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Finding the Fourth Proportional to 74.54, 102.77 and 65.90

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Solution

The fourth proportional to 74.54, 102.77 and 65.90 is: 90.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.54 : 102.77 = 65.90 : x
  2. Step 2: Convert to fraction form
    74.54/102.77 = 65.90/x
  3. Step 3: Cross multiply
    74.54x = 102.77 × 65.90
  4. Step 4: Simplify right side
    74.54x = 6,772.19
  5. Step 5: Solve for x
    x = 6,772.19/74.54
  6. Step 6: Final answer
    x = 90.86

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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.