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Finding the Fourth Proportional to 71.42, 107.16 and 65.48

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Solution

The fourth proportional to 71.42, 107.16 and 65.48 is: 98.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.42 : 107.16 = 65.48 : x
  2. Step 2: Convert to fraction form
    71.42/107.16 = 65.48/x
  3. Step 3: Cross multiply
    71.42x = 107.16 × 65.48
  4. Step 4: Simplify right side
    71.42x = 7,016.84
  5. Step 5: Solve for x
    x = 7,016.84/71.42
  6. Step 6: Final answer
    x = 98.25

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.