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Finding the Fourth Proportional to 1,260.80, 1,891.64 and 611.36

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Solution

The fourth proportional to 1,260.80, 1,891.64 and 611.36 is: 917.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,260.80 : 1,891.64 = 611.36 : x
  2. Step 2: Convert to fraction form
    1,260.80/1,891.64 = 611.36/x
  3. Step 3: Cross multiply
    1,260.80x = 1,891.64 × 611.36
  4. Step 4: Simplify right side
    1,260.80x = 1,156,473.03
  5. Step 5: Solve for x
    x = 1,156,473.03/1,260.80
  6. Step 6: Final answer
    x = 917.25

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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.