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Finding the Fourth Proportional to 74.39, 102.60 and 71.42

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Solution

The fourth proportional to 74.39, 102.60 and 71.42 is: 98.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.39 : 102.60 = 71.42 : x
  2. Step 2: Convert to fraction form
    74.39/102.60 = 71.42/x
  3. Step 3: Cross multiply
    74.39x = 102.60 × 71.42
  4. Step 4: Simplify right side
    74.39x = 7,327.18
  5. Step 5: Solve for x
    x = 7,327.18/74.39
  6. Step 6: Final answer
    x = 98.50

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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.