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Finding the Fourth Proportional to 787.38, 1,181.54 and 440.56

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Solution

The fourth proportional to 787.38, 1,181.54 and 440.56 is: 661.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    787.38 : 1,181.54 = 440.56 : x
  2. Step 2: Convert to fraction form
    787.38/1,181.54 = 440.56/x
  3. Step 3: Cross multiply
    787.38x = 1,181.54 × 440.56
  4. Step 4: Simplify right side
    787.38x = 520,539.26
  5. Step 5: Solve for x
    x = 520,539.26/787.38
  6. Step 6: Final answer
    x = 661.10

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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.