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Finding the Fourth Proportional to 787.03, 1,178.74 and 439.60

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Solution

The fourth proportional to 787.03, 1,178.74 and 439.60 is: 658.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    787.03 : 1,178.74 = 439.60 : x
  2. Step 2: Convert to fraction form
    787.03/1,178.74 = 439.60/x
  3. Step 3: Cross multiply
    787.03x = 1,178.74 × 439.60
  4. Step 4: Simplify right side
    787.03x = 518,174.10
  5. Step 5: Solve for x
    x = 518,174.10/787.03
  6. Step 6: Final answer
    x = 658.39

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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.