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Finding the Fourth Proportional to 448.25, 673.19 and 390.88

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Solution

The fourth proportional to 448.25, 673.19 and 390.88 is: 587.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    448.25 : 673.19 = 390.88 : x
  2. Step 2: Convert to fraction form
    448.25/673.19 = 390.88/x
  3. Step 3: Cross multiply
    448.25x = 673.19 × 390.88
  4. Step 4: Simplify right side
    448.25x = 263,135.80
  5. Step 5: Solve for x
    x = 263,135.80/448.25
  6. Step 6: Final answer
    x = 587.03

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.