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Finding the Fourth Proportional to 390.48, 582.56 and 349.56

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Solution

The fourth proportional to 390.48, 582.56 and 349.56 is: 521.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.48 : 582.56 = 349.56 : x
  2. Step 2: Convert to fraction form
    390.48/582.56 = 349.56/x
  3. Step 3: Cross multiply
    390.48x = 582.56 × 349.56
  4. Step 4: Simplify right side
    390.48x = 203,639.67
  5. Step 5: Solve for x
    x = 203,639.67/390.48
  6. Step 6: Final answer
    x = 521.51

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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.