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Finding the Fourth Proportional to 787.61, 1,181.34 and 479.39

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Solution

The fourth proportional to 787.61, 1,181.34 and 479.39 is: 719.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    787.61 : 1,181.34 = 479.39 : x
  2. Step 2: Convert to fraction form
    787.61/1,181.34 = 479.39/x
  3. Step 3: Cross multiply
    787.61x = 1,181.34 × 479.39
  4. Step 4: Simplify right side
    787.61x = 566,316.68
  5. Step 5: Solve for x
    x = 566,316.68/787.61
  6. Step 6: Final answer
    x = 719.03

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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.