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Finding the Fourth Proportional to 207.16, 286.11 and 154.91

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Solution

The fourth proportional to 207.16, 286.11 and 154.91 is: 213.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    207.16 : 286.11 = 154.91 : x
  2. Step 2: Convert to fraction form
    207.16/286.11 = 154.91/x
  3. Step 3: Cross multiply
    207.16x = 286.11 × 154.91
  4. Step 4: Simplify right side
    207.16x = 44,322.02
  5. Step 5: Solve for x
    x = 44,322.02/207.16
  6. Step 6: Final answer
    x = 213.95

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.