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Finding the Fourth Proportional to 71.42, 106.47 and 63.68

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Solution

The fourth proportional to 71.42, 106.47 and 63.68 is: 94.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.42 : 106.47 = 63.68 : x
  2. Step 2: Convert to fraction form
    71.42/106.47 = 63.68/x
  3. Step 3: Cross multiply
    71.42x = 106.47 × 63.68
  4. Step 4: Simplify right side
    71.42x = 6,780.01
  5. Step 5: Solve for x
    x = 6,780.01/71.42
  6. Step 6: Final answer
    x = 94.93

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.