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Finding the Fourth Proportional to 465.57, 642.38 and 290.79

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Solution

The fourth proportional to 465.57, 642.38 and 290.79 is: 401.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    465.57 : 642.38 = 290.79 : x
  2. Step 2: Convert to fraction form
    465.57/642.38 = 290.79/x
  3. Step 3: Cross multiply
    465.57x = 642.38 × 290.79
  4. Step 4: Simplify right side
    465.57x = 186,796.23
  5. Step 5: Solve for x
    x = 186,796.23/465.57
  6. Step 6: Final answer
    x = 401.22

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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.