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Finding the Fourth Proportional to 71.20, 106.01 and 70.80

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Solution

The fourth proportional to 71.20, 106.01 and 70.80 is: 105.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.20 : 106.01 = 70.80 : x
  2. Step 2: Convert to fraction form
    71.20/106.01 = 70.80/x
  3. Step 3: Cross multiply
    71.20x = 106.01 × 70.80
  4. Step 4: Simplify right side
    71.20x = 7,505.51
  5. Step 5: Solve for x
    x = 7,505.51/71.20
  6. Step 6: Final answer
    x = 105.41

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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.