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Finding the Fourth Proportional to 255.95, 383.76 and 91.31

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Solution

The fourth proportional to 255.95, 383.76 and 91.31 is: 136.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.95 : 383.76 = 91.31 : x
  2. Step 2: Convert to fraction form
    255.95/383.76 = 91.31/x
  3. Step 3: Cross multiply
    255.95x = 383.76 × 91.31
  4. Step 4: Simplify right side
    255.95x = 35,041.13
  5. Step 5: Solve for x
    x = 35,041.13/255.95
  6. Step 6: Final answer
    x = 136.91

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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.