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Finding the Fourth Proportional to 269.59, 403.90 and 215.09

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Solution

The fourth proportional to 269.59, 403.90 and 215.09 is: 322.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    269.59 : 403.90 = 215.09 : x
  2. Step 2: Convert to fraction form
    269.59/403.90 = 215.09/x
  3. Step 3: Cross multiply
    269.59x = 403.90 × 215.09
  4. Step 4: Simplify right side
    269.59x = 86,871.76
  5. Step 5: Solve for x
    x = 86,871.76/269.59
  6. Step 6: Final answer
    x = 322.24

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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.