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Finding the Fourth Proportional to 392.42, 590.80 and 339.50

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Solution

The fourth proportional to 392.42, 590.80 and 339.50 is: 511.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.42 : 590.80 = 339.50 : x
  2. Step 2: Convert to fraction form
    392.42/590.80 = 339.50/x
  3. Step 3: Cross multiply
    392.42x = 590.80 × 339.50
  4. Step 4: Simplify right side
    392.42x = 200,574.90
  5. Step 5: Solve for x
    x = 200,574.90/392.42
  6. Step 6: Final answer
    x = 511.12

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.