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Finding the Fourth Proportional to 276.60, 415.20 and 275.28

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Solution

The fourth proportional to 276.60, 415.20 and 275.28 is: 413.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    276.60 : 415.20 = 275.28 : x
  2. Step 2: Convert to fraction form
    276.60/415.20 = 275.28/x
  3. Step 3: Cross multiply
    276.60x = 415.20 × 275.28
  4. Step 4: Simplify right side
    276.60x = 114,296.26
  5. Step 5: Solve for x
    x = 114,296.26/276.60
  6. Step 6: Final answer
    x = 413.22

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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.