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Finding the Fourth Proportional to 251.03, 376.61 and 86.50

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Solution

The fourth proportional to 251.03, 376.61 and 86.50 is: 129.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    251.03 : 376.61 = 86.50 : x
  2. Step 2: Convert to fraction form
    251.03/376.61 = 86.50/x
  3. Step 3: Cross multiply
    251.03x = 376.61 × 86.50
  4. Step 4: Simplify right side
    251.03x = 32,574.45
  5. Step 5: Solve for x
    x = 32,574.45/251.03
  6. Step 6: Final answer
    x = 129.76

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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.