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Finding the Fourth Proportional to 579.12, 798.45 and 392.34

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Solution

The fourth proportional to 579.12, 798.45 and 392.34 is: 540.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    579.12 : 798.45 = 392.34 : x
  2. Step 2: Convert to fraction form
    579.12/798.45 = 392.34/x
  3. Step 3: Cross multiply
    579.12x = 798.45 × 392.34
  4. Step 4: Simplify right side
    579.12x = 313,263.87
  5. Step 5: Solve for x
    x = 313,263.87/579.12
  6. Step 6: Final answer
    x = 540.93

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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.