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Finding the Fourth Proportional to 390.52, 582.90 and 344.40

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Solution

The fourth proportional to 390.52, 582.90 and 344.40 is: 514.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.52 : 582.90 = 344.40 : x
  2. Step 2: Convert to fraction form
    390.52/582.90 = 344.40/x
  3. Step 3: Cross multiply
    390.52x = 582.90 × 344.40
  4. Step 4: Simplify right side
    390.52x = 200,750.56
  5. Step 5: Solve for x
    x = 200,750.56/390.52
  6. Step 6: Final answer
    x = 514.06

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.