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Finding the Fourth Proportional to 389.63, 537.24 and 291.22

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Solution

The fourth proportional to 389.63, 537.24 and 291.22 is: 401.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.63 : 537.24 = 291.22 : x
  2. Step 2: Convert to fraction form
    389.63/537.24 = 291.22/x
  3. Step 3: Cross multiply
    389.63x = 537.24 × 291.22
  4. Step 4: Simplify right side
    389.63x = 156,454.78
  5. Step 5: Solve for x
    x = 156,454.78/389.63
  6. Step 6: Final answer
    x = 401.54

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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.