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Finding the Fourth Proportional to 879.08, 1,318.91 and 392.46

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Solution

The fourth proportional to 879.08, 1,318.91 and 392.46 is: 588.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.08 : 1,318.91 = 392.46 : x
  2. Step 2: Convert to fraction form
    879.08/1,318.91 = 392.46/x
  3. Step 3: Cross multiply
    879.08x = 1,318.91 × 392.46
  4. Step 4: Simplify right side
    879.08x = 517,617.46
  5. Step 5: Solve for x
    x = 517,617.46/879.08
  6. Step 6: Final answer
    x = 588.82

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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.