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Finding the Fourth Proportional to 148.79, 205.49 and 105.05

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Solution

The fourth proportional to 148.79, 205.49 and 105.05 is: 145.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    148.79 : 205.49 = 105.05 : x
  2. Step 2: Convert to fraction form
    148.79/205.49 = 105.05/x
  3. Step 3: Cross multiply
    148.79x = 205.49 × 105.05
  4. Step 4: Simplify right side
    148.79x = 21,586.72
  5. Step 5: Solve for x
    x = 21,586.72/148.79
  6. Step 6: Final answer
    x = 145.08

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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.