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Finding the Fourth Proportional to 276.61, 415.14 and 139.60

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Solution

The fourth proportional to 276.61, 415.14 and 139.60 is: 209.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    276.61 : 415.14 = 139.60 : x
  2. Step 2: Convert to fraction form
    276.61/415.14 = 139.60/x
  3. Step 3: Cross multiply
    276.61x = 415.14 × 139.60
  4. Step 4: Simplify right side
    276.61x = 57,953.54
  5. Step 5: Solve for x
    x = 57,953.54/276.61
  6. Step 6: Final answer
    x = 209.51

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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.