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Finding the Fourth Proportional to 291.18, 401.96 and 207.21

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Solution

The fourth proportional to 291.18, 401.96 and 207.21 is: 286.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    291.18 : 401.96 = 207.21 : x
  2. Step 2: Convert to fraction form
    291.18/401.96 = 207.21/x
  3. Step 3: Cross multiply
    291.18x = 401.96 × 207.21
  4. Step 4: Simplify right side
    291.18x = 83,290.13
  5. Step 5: Solve for x
    x = 83,290.13/291.18
  6. Step 6: Final answer
    x = 286.04

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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.