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Finding the Fourth Proportional to 465.80, 642.80 and 269.31

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Solution

The fourth proportional to 465.80, 642.80 and 269.31 is: 371.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    465.80 : 642.80 = 269.31 : x
  2. Step 2: Convert to fraction form
    465.80/642.80 = 269.31/x
  3. Step 3: Cross multiply
    465.80x = 642.80 × 269.31
  4. Step 4: Simplify right side
    465.80x = 173,113.14
  5. Step 5: Solve for x
    x = 173,113.14/465.80
  6. Step 6: Final answer
    x = 371.64

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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.