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Finding the Fourth Proportional to 465.62, 642.63 and 279.19

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Solution

The fourth proportional to 465.62, 642.63 and 279.19 is: 385.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    465.62 : 642.63 = 279.19 : x
  2. Step 2: Convert to fraction form
    465.62/642.63 = 279.19/x
  3. Step 3: Cross multiply
    465.62x = 642.63 × 279.19
  4. Step 4: Simplify right side
    465.62x = 179,415.87
  5. Step 5: Solve for x
    x = 179,415.87/465.62
  6. Step 6: Final answer
    x = 385.33

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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.