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Finding the Fourth Proportional to 74.07, 102.15 and 65.97

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Solution

The fourth proportional to 74.07, 102.15 and 65.97 is: 90.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.07 : 102.15 = 65.97 : x
  2. Step 2: Convert to fraction form
    74.07/102.15 = 65.97/x
  3. Step 3: Cross multiply
    74.07x = 102.15 × 65.97
  4. Step 4: Simplify right side
    74.07x = 6,738.84
  5. Step 5: Solve for x
    x = 6,738.84/74.07
  6. Step 6: Final answer
    x = 90.98

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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.