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Finding the Fourth Proportional to 207.15, 310.75 and 91.58

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Solution

The fourth proportional to 207.15, 310.75 and 91.58 is: 137.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    207.15 : 310.75 = 91.58 : x
  2. Step 2: Convert to fraction form
    207.15/310.75 = 91.58/x
  3. Step 3: Cross multiply
    207.15x = 310.75 × 91.58
  4. Step 4: Simplify right side
    207.15x = 28,458.03
  5. Step 5: Solve for x
    x = 28,458.03/207.15
  6. Step 6: Final answer
    x = 137.38

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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.