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Finding the Fourth Proportional to 787.56, 1,181.16 and 513.78

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Solution

The fourth proportional to 787.56, 1,181.16 and 513.78 is: 770.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    787.56 : 1,181.16 = 513.78 : x
  2. Step 2: Convert to fraction form
    787.56/1,181.16 = 513.78/x
  3. Step 3: Cross multiply
    787.56x = 1,181.16 × 513.78
  4. Step 4: Simplify right side
    787.56x = 606,856.38
  5. Step 5: Solve for x
    x = 606,856.38/787.56
  6. Step 6: Final answer
    x = 770.55

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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.