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Finding the Fourth Proportional to 207.08, 310.72 and 91.60

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Solution

The fourth proportional to 207.08, 310.72 and 91.60 is: 137.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    207.08 : 310.72 = 91.60 : x
  2. Step 2: Convert to fraction form
    207.08/310.72 = 91.60/x
  3. Step 3: Cross multiply
    207.08x = 310.72 × 91.60
  4. Step 4: Simplify right side
    207.08x = 28,461.87
  5. Step 5: Solve for x
    x = 28,461.87/207.08
  6. Step 6: Final answer
    x = 137.45

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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.