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Finding the Fourth Proportional to 149.78, 206.73 and 87.59

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Solution

The fourth proportional to 149.78, 206.73 and 87.59 is: 120.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    149.78 : 206.73 = 87.59 : x
  2. Step 2: Convert to fraction form
    149.78/206.73 = 87.59/x
  3. Step 3: Cross multiply
    149.78x = 206.73 × 87.59
  4. Step 4: Simplify right side
    149.78x = 18,106.45
  5. Step 5: Solve for x
    x = 18,106.45/149.78
  6. Step 6: Final answer
    x = 120.89

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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.