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Finding the Fourth Proportional to 102.99, 154.37 and 72.51

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Solution

The fourth proportional to 102.99, 154.37 and 72.51 is: 108.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    102.99 : 154.37 = 72.51 : x
  2. Step 2: Convert to fraction form
    102.99/154.37 = 72.51/x
  3. Step 3: Cross multiply
    102.99x = 154.37 × 72.51
  4. Step 4: Simplify right side
    102.99x = 11,193.01
  5. Step 5: Solve for x
    x = 11,193.01/102.99
  6. Step 6: Final answer
    x = 108.68

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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.