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Finding the Fourth Proportional to 71.15, 106.70 and 22.40

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Solution

The fourth proportional to 71.15, 106.70 and 22.40 is: 33.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.15 : 106.70 = 22.40 : x
  2. Step 2: Convert to fraction form
    71.15/106.70 = 22.40/x
  3. Step 3: Cross multiply
    71.15x = 106.70 × 22.40
  4. Step 4: Simplify right side
    71.15x = 2,390.36
  5. Step 5: Solve for x
    x = 2,390.36/71.15
  6. Step 6: Final answer
    x = 33.59

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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.