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Finding the Fourth Proportional to 102.99, 154.51 and 72.75

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Solution

The fourth proportional to 102.99, 154.51 and 72.75 is: 109.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    102.99 : 154.51 = 72.75 : x
  2. Step 2: Convert to fraction form
    102.99/154.51 = 72.75/x
  3. Step 3: Cross multiply
    102.99x = 154.51 × 72.75
  4. Step 4: Simplify right side
    102.99x = 11,240.60
  5. Step 5: Solve for x
    x = 11,240.60/102.99
  6. Step 6: Final answer
    x = 109.14

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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.