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Finding the Fourth Proportional to 879.74, 1,319.96 and 392.45

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Solution

The fourth proportional to 879.74, 1,319.96 and 392.45 is: 588.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.74 : 1,319.96 = 392.45 : x
  2. Step 2: Convert to fraction form
    879.74/1,319.96 = 392.45/x
  3. Step 3: Cross multiply
    879.74x = 1,319.96 × 392.45
  4. Step 4: Simplify right side
    879.74x = 518,018.30
  5. Step 5: Solve for x
    x = 518,018.30/879.74
  6. Step 6: Final answer
    x = 588.83

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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.