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Finding the Fourth Proportional to 787.54, 1,179.72 and 475.02

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Solution

The fourth proportional to 787.54, 1,179.72 and 475.02 is: 711.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    787.54 : 1,179.72 = 475.02 : x
  2. Step 2: Convert to fraction form
    787.54/1,179.72 = 475.02/x
  3. Step 3: Cross multiply
    787.54x = 1,179.72 × 475.02
  4. Step 4: Simplify right side
    787.54x = 560,390.59
  5. Step 5: Solve for x
    x = 560,390.59/787.54
  6. Step 6: Final answer
    x = 711.57

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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.