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Finding the Fourth Proportional to 1,661.20, 2,490.75 and 880.72

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Solution

The fourth proportional to 1,661.20, 2,490.75 and 880.72 is: 1,320.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,661.20 : 2,490.75 = 880.72 : x
  2. Step 2: Convert to fraction form
    1,661.20/2,490.75 = 880.72/x
  3. Step 3: Cross multiply
    1,661.20x = 2,490.75 × 880.72
  4. Step 4: Simplify right side
    1,661.20x = 2,193,647.11
  5. Step 5: Solve for x
    x = 2,193,647.11/1,661.20
  6. Step 6: Final answer
    x = 1,320.52

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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.