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Finding the Fourth Proportional to 1,761.78, 2,642.85 and 651.49

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Solution

The fourth proportional to 1,761.78, 2,642.85 and 651.49 is: 977.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,761.78 : 2,642.85 = 651.49 : x
  2. Step 2: Convert to fraction form
    1,761.78/2,642.85 = 651.49/x
  3. Step 3: Cross multiply
    1,761.78x = 2,642.85 × 651.49
  4. Step 4: Simplify right side
    1,761.78x = 1,721,793.65
  5. Step 5: Solve for x
    x = 1,721,793.65/1,761.78
  6. Step 6: Final answer
    x = 977.30

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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.