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Finding the Fourth Proportional to 787.09, 1,181.13 and 440.67

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Solution

The fourth proportional to 787.09, 1,181.13 and 440.67 is: 661.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    787.09 : 1,181.13 = 440.67 : x
  2. Step 2: Convert to fraction form
    787.09/1,181.13 = 440.67/x
  3. Step 3: Cross multiply
    787.09x = 1,181.13 × 440.67
  4. Step 4: Simplify right side
    787.09x = 520,483.85
  5. Step 5: Solve for x
    x = 520,483.85/787.09
  6. Step 6: Final answer
    x = 661.27

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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.