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Finding the Fourth Proportional to 206.95, 310.53 and 98.74

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Solution

The fourth proportional to 206.95, 310.53 and 98.74 is: 148.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    206.95 : 310.53 = 98.74 : x
  2. Step 2: Convert to fraction form
    206.95/310.53 = 98.74/x
  3. Step 3: Cross multiply
    206.95x = 310.53 × 98.74
  4. Step 4: Simplify right side
    206.95x = 30,661.73
  5. Step 5: Solve for x
    x = 30,661.73/206.95
  6. Step 6: Final answer
    x = 148.16

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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.