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Finding the Fourth Proportional to 446.49, 667.14 and 390.90

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Solution

The fourth proportional to 446.49, 667.14 and 390.90 is: 584.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    446.49 : 667.14 = 390.90 : x
  2. Step 2: Convert to fraction form
    446.49/667.14 = 390.90/x
  3. Step 3: Cross multiply
    446.49x = 667.14 × 390.90
  4. Step 4: Simplify right side
    446.49x = 260,785.03
  5. Step 5: Solve for x
    x = 260,785.03/446.49
  6. Step 6: Final answer
    x = 584.08

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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.