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Finding the Fourth Proportional to 102.79, 154.23 and 45.75

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Solution

The fourth proportional to 102.79, 154.23 and 45.75 is: 68.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    102.79 : 154.23 = 45.75 : x
  2. Step 2: Convert to fraction form
    102.79/154.23 = 45.75/x
  3. Step 3: Cross multiply
    102.79x = 154.23 × 45.75
  4. Step 4: Simplify right side
    102.79x = 7,055.79
  5. Step 5: Solve for x
    x = 7,055.79/102.79
  6. Step 6: Final answer
    x = 68.64

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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.