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Finding the Fourth Proportional to 390.99, 583.49 and 349.39

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Solution

The fourth proportional to 390.99, 583.49 and 349.39 is: 521.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.99 : 583.49 = 349.39 : x
  2. Step 2: Convert to fraction form
    390.99/583.49 = 349.39/x
  3. Step 3: Cross multiply
    390.99x = 583.49 × 349.39
  4. Step 4: Simplify right side
    390.99x = 203,865.57
  5. Step 5: Solve for x
    x = 203,865.57/390.99
  6. Step 6: Final answer
    x = 521.41

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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.