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Finding the Fourth Proportional to 787.71, 1,181.88 and 422.40

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Solution

The fourth proportional to 787.71, 1,181.88 and 422.40 is: 633.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    787.71 : 1,181.88 = 422.40 : x
  2. Step 2: Convert to fraction form
    787.71/1,181.88 = 422.40/x
  3. Step 3: Cross multiply
    787.71x = 1,181.88 × 422.40
  4. Step 4: Simplify right side
    787.71x = 499,226.11
  5. Step 5: Solve for x
    x = 499,226.11/787.71
  6. Step 6: Final answer
    x = 633.77

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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.