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Finding the Fourth Proportional to 879.35, 1,318.84 and 392.09

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Solution

The fourth proportional to 879.35, 1,318.84 and 392.09 is: 588.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.35 : 1,318.84 = 392.09 : x
  2. Step 2: Convert to fraction form
    879.35/1,318.84 = 392.09/x
  3. Step 3: Cross multiply
    879.35x = 1,318.84 × 392.09
  4. Step 4: Simplify right side
    879.35x = 517,096.40
  5. Step 5: Solve for x
    x = 517,096.40/879.35
  6. Step 6: Final answer
    x = 588.05

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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.