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Finding the Fourth Proportional to 2,761.90, 4,143.08 and 787.53

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Solution

The fourth proportional to 2,761.90, 4,143.08 and 787.53 is: 1,181.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,761.90 : 4,143.08 = 787.53 : x
  2. Step 2: Convert to fraction form
    2,761.90/4,143.08 = 787.53/x
  3. Step 3: Cross multiply
    2,761.90x = 4,143.08 × 787.53
  4. Step 4: Simplify right side
    2,761.90x = 3,262,799.79
  5. Step 5: Solve for x
    x = 3,262,799.79/2,761.90
  6. Step 6: Final answer
    x = 1,181.36

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1.5x scale

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.