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Finding the Fourth Proportional to 1,761.60, 2,642.46 and 787.68

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Solution

The fourth proportional to 1,761.60, 2,642.46 and 787.68 is: 1,181.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,761.60 : 2,642.46 = 787.68 : x
  2. Step 2: Convert to fraction form
    1,761.60/2,642.46 = 787.68/x
  3. Step 3: Cross multiply
    1,761.60x = 2,642.46 × 787.68
  4. Step 4: Simplify right side
    1,761.60x = 2,081,412.89
  5. Step 5: Solve for x
    x = 2,081,412.89/1,761.60
  6. Step 6: Final answer
    x = 1,181.55

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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.