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Finding the Fourth Proportional to 465.96, 642.78 and 291.24

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Solution

The fourth proportional to 465.96, 642.78 and 291.24 is: 401.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    465.96 : 642.78 = 291.24 : x
  2. Step 2: Convert to fraction form
    465.96/642.78 = 291.24/x
  3. Step 3: Cross multiply
    465.96x = 642.78 × 291.24
  4. Step 4: Simplify right side
    465.96x = 187,203.25
  5. Step 5: Solve for x
    x = 187,203.25/465.96
  6. Step 6: Final answer
    x = 401.76

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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.