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Finding the Fourth Proportional to 427.98, 642.24 and 291.27

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Solution

The fourth proportional to 427.98, 642.24 and 291.27 is: 437.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    427.98 : 642.24 = 291.27 : x
  2. Step 2: Convert to fraction form
    427.98/642.24 = 291.27/x
  3. Step 3: Cross multiply
    427.98x = 642.24 × 291.27
  4. Step 4: Simplify right side
    427.98x = 187,065.24
  5. Step 5: Solve for x
    x = 187,065.24/427.98
  6. Step 6: Final answer
    x = 437.09

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.