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Finding the Fourth Proportional to 107.13, 147.87 and 72.21

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Solution

The fourth proportional to 107.13, 147.87 and 72.21 is: 99.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    107.13 : 147.87 = 72.21 : x
  2. Step 2: Convert to fraction form
    107.13/147.87 = 72.21/x
  3. Step 3: Cross multiply
    107.13x = 147.87 × 72.21
  4. Step 4: Simplify right side
    107.13x = 10,677.69
  5. Step 5: Solve for x
    x = 10,677.69/107.13
  6. Step 6: Final answer
    x = 99.67

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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.