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Finding the Fourth Proportional to 269.99, 404.95 and 87.40

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Solution

The fourth proportional to 269.99, 404.95 and 87.40 is: 131.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    269.99 : 404.95 = 87.40 : x
  2. Step 2: Convert to fraction form
    269.99/404.95 = 87.40/x
  3. Step 3: Cross multiply
    269.99x = 404.95 × 87.40
  4. Step 4: Simplify right side
    269.99x = 35,392.63
  5. Step 5: Solve for x
    x = 35,392.63/269.99
  6. Step 6: Final answer
    x = 131.09

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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.