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Finding the Fourth Proportional to 291.42, 402.17 and 158.64

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Solution

The fourth proportional to 291.42, 402.17 and 158.64 is: 218.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    291.42 : 402.17 = 158.64 : x
  2. Step 2: Convert to fraction form
    291.42/402.17 = 158.64/x
  3. Step 3: Cross multiply
    291.42x = 402.17 × 158.64
  4. Step 4: Simplify right side
    291.42x = 63,800.25
  5. Step 5: Solve for x
    x = 63,800.25/291.42
  6. Step 6: Final answer
    x = 218.93

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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.