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Finding the Fourth Proportional to 149.90, 206.86 and 84.40

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Solution

The fourth proportional to 149.90, 206.86 and 84.40 is: 116.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    149.90 : 206.86 = 84.40 : x
  2. Step 2: Convert to fraction form
    149.90/206.86 = 84.40/x
  3. Step 3: Cross multiply
    149.90x = 206.86 × 84.40
  4. Step 4: Simplify right side
    149.90x = 17,458.98
  5. Step 5: Solve for x
    x = 17,458.98/149.90
  6. Step 6: Final answer
    x = 116.47

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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.