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Finding the Fourth Proportional to 71.64, 106.65 and 68.58

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Solution

The fourth proportional to 71.64, 106.65 and 68.58 is: 102.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.64 : 106.65 = 68.58 : x
  2. Step 2: Convert to fraction form
    71.64/106.65 = 68.58/x
  3. Step 3: Cross multiply
    71.64x = 106.65 × 68.58
  4. Step 4: Simplify right side
    71.64x = 7,314.06
  5. Step 5: Solve for x
    x = 7,314.06/71.64
  6. Step 6: Final answer
    x = 102.09

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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.