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Finding the Fourth Proportional to 103.15, 154.78 and 45.37

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Solution

The fourth proportional to 103.15, 154.78 and 45.37 is: 68.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.15 : 154.78 = 45.37 : x
  2. Step 2: Convert to fraction form
    103.15/154.78 = 45.37/x
  3. Step 3: Cross multiply
    103.15x = 154.78 × 45.37
  4. Step 4: Simplify right side
    103.15x = 7,022.37
  5. Step 5: Solve for x
    x = 7,022.37/103.15
  6. Step 6: Final answer
    x = 68.08

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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.