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Finding the Fourth Proportional to 1,760.80, 2,641.56 and 787

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Solution

The fourth proportional to 1,760.80, 2,641.56 and 787 is: 1,180.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,760.80 : 2,641.56 = 787 : x
  2. Step 2: Convert to fraction form
    1,760.80/2,641.56 = 787/x
  3. Step 3: Cross multiply
    1,760.80x = 2,641.56 × 787
  4. Step 4: Simplify right side
    1,760.80x = 2,078,907.72
  5. Step 5: Solve for x
    x = 2,078,907.72/1,760.80
  6. Step 6: Final answer
    x = 1,180.66

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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.