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Finding the Fourth Proportional to 250.80, 376.06 and 86.21

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Solution

The fourth proportional to 250.80, 376.06 and 86.21 is: 129.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    250.80 : 376.06 = 86.21 : x
  2. Step 2: Convert to fraction form
    250.80/376.06 = 86.21/x
  3. Step 3: Cross multiply
    250.80x = 376.06 × 86.21
  4. Step 4: Simplify right side
    250.80x = 32,420.13
  5. Step 5: Solve for x
    x = 32,420.13/250.80
  6. Step 6: Final answer
    x = 129.27

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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.