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Finding the Fourth Proportional to 879.04, 1,318.08 and 392.56

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Solution

The fourth proportional to 879.04, 1,318.08 and 392.56 is: 588.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.04 : 1,318.08 = 392.56 : x
  2. Step 2: Convert to fraction form
    879.04/1,318.08 = 392.56/x
  3. Step 3: Cross multiply
    879.04x = 1,318.08 × 392.56
  4. Step 4: Simplify right side
    879.04x = 517,425.48
  5. Step 5: Solve for x
    x = 517,425.48/879.04
  6. Step 6: Final answer
    x = 588.63

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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.