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Finding the Fourth Proportional to 207.19, 310.57 and 99.05

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Solution

The fourth proportional to 207.19, 310.57 and 99.05 is: 148.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    207.19 : 310.57 = 99.05 : x
  2. Step 2: Convert to fraction form
    207.19/310.57 = 99.05/x
  3. Step 3: Cross multiply
    207.19x = 310.57 × 99.05
  4. Step 4: Simplify right side
    207.19x = 30,761.96
  5. Step 5: Solve for x
    x = 30,761.96/207.19
  6. Step 6: Final answer
    x = 148.48

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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.