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Finding the Fourth Proportional to 255.27, 382.93 and 90.70

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Solution

The fourth proportional to 255.27, 382.93 and 90.70 is: 136.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.27 : 382.93 = 90.70 : x
  2. Step 2: Convert to fraction form
    255.27/382.93 = 90.70/x
  3. Step 3: Cross multiply
    255.27x = 382.93 × 90.70
  4. Step 4: Simplify right side
    255.27x = 34,731.75
  5. Step 5: Solve for x
    x = 34,731.75/255.27
  6. Step 6: Final answer
    x = 136.06

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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.