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Finding the Fourth Proportional to 206.66, 310.12 and 84.90

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Solution

The fourth proportional to 206.66, 310.12 and 84.90 is: 127.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    206.66 : 310.12 = 84.90 : x
  2. Step 2: Convert to fraction form
    206.66/310.12 = 84.90/x
  3. Step 3: Cross multiply
    206.66x = 310.12 × 84.90
  4. Step 4: Simplify right side
    206.66x = 26,329.19
  5. Step 5: Solve for x
    x = 26,329.19/206.66
  6. Step 6: Final answer
    x = 127.40

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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.