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Finding the Fourth Proportional to 264.09, 396.15 and 90.75

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Solution

The fourth proportional to 264.09, 396.15 and 90.75 is: 136.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    264.09 : 396.15 = 90.75 : x
  2. Step 2: Convert to fraction form
    264.09/396.15 = 90.75/x
  3. Step 3: Cross multiply
    264.09x = 396.15 × 90.75
  4. Step 4: Simplify right side
    264.09x = 35,950.61
  5. Step 5: Solve for x
    x = 35,950.61/264.09
  6. Step 6: Final answer
    x = 136.13

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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.