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Finding the Fourth Proportional to 148.61, 205.09 and 99.59

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Solution

The fourth proportional to 148.61, 205.09 and 99.59 is: 137.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    148.61 : 205.09 = 99.59 : x
  2. Step 2: Convert to fraction form
    148.61/205.09 = 99.59/x
  3. Step 3: Cross multiply
    148.61x = 205.09 × 99.59
  4. Step 4: Simplify right side
    148.61x = 20,423.64
  5. Step 5: Solve for x
    x = 20,423.64/148.61
  6. Step 6: Final answer
    x = 137.43

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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.