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Finding the Fourth Proportional to 107.22, 147.95 and 72.20

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Solution

The fourth proportional to 107.22, 147.95 and 72.20 is: 99.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    107.22 : 147.95 = 72.20 : x
  2. Step 2: Convert to fraction form
    107.22/147.95 = 72.20/x
  3. Step 3: Cross multiply
    107.22x = 147.95 × 72.20
  4. Step 4: Simplify right side
    107.22x = 10,680.89
  5. Step 5: Solve for x
    x = 10,680.89/107.22
  6. Step 6: Final answer
    x = 99.62

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.