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Finding the Fourth Proportional to 291.67, 401.65 and 217.86

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Solution

The fourth proportional to 291.67, 401.65 and 217.86 is: 300.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    291.67 : 401.65 = 217.86 : x
  2. Step 2: Convert to fraction form
    291.67/401.65 = 217.86/x
  3. Step 3: Cross multiply
    291.67x = 401.65 × 217.86
  4. Step 4: Simplify right side
    291.67x = 87,503.47
  5. Step 5: Solve for x
    x = 87,503.47/291.67
  6. Step 6: Final answer
    x = 300.01

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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.