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Finding the Fourth Proportional to 660.52, 990.40 and 276.04

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Solution

The fourth proportional to 660.52, 990.40 and 276.04 is: 413.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.52 : 990.40 = 276.04 : x
  2. Step 2: Convert to fraction form
    660.52/990.40 = 276.04/x
  3. Step 3: Cross multiply
    660.52x = 990.40 × 276.04
  4. Step 4: Simplify right side
    660.52x = 273,390.02
  5. Step 5: Solve for x
    x = 273,390.02/660.52
  6. Step 6: Final answer
    x = 413.90

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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.