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Finding the Fourth Proportional to 927.04, 1,279.86 and 578.20

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Solution

The fourth proportional to 927.04, 1,279.86 and 578.20 is: 798.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    927.04 : 1,279.86 = 578.20 : x
  2. Step 2: Convert to fraction form
    927.04/1,279.86 = 578.20/x
  3. Step 3: Cross multiply
    927.04x = 1,279.86 × 578.20
  4. Step 4: Simplify right side
    927.04x = 740,015.05
  5. Step 5: Solve for x
    x = 740,015.05/927.04
  6. Step 6: Final answer
    x = 798.26

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.