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Finding the Fourth Proportional to 207.58, 311.43 and 99.43

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Solution

The fourth proportional to 207.58, 311.43 and 99.43 is: 149.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    207.58 : 311.43 = 99.43 : x
  2. Step 2: Convert to fraction form
    207.58/311.43 = 99.43/x
  3. Step 3: Cross multiply
    207.58x = 311.43 × 99.43
  4. Step 4: Simplify right side
    207.58x = 30,965.48
  5. Step 5: Solve for x
    x = 30,965.48/207.58
  6. Step 6: Final answer
    x = 149.17

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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.