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Finding the Fourth Proportional to 71.04, 105.99 and 68.88

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Solution

The fourth proportional to 71.04, 105.99 and 68.88 is: 102.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.04 : 105.99 = 68.88 : x
  2. Step 2: Convert to fraction form
    71.04/105.99 = 68.88/x
  3. Step 3: Cross multiply
    71.04x = 105.99 × 68.88
  4. Step 4: Simplify right side
    71.04x = 7,300.59
  5. Step 5: Solve for x
    x = 7,300.59/71.04
  6. Step 6: Final answer
    x = 102.77

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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.