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Finding the Fourth Proportional to 447.06, 670.68 and 138.92

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Solution

The fourth proportional to 447.06, 670.68 and 138.92 is: 208.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    447.06 : 670.68 = 138.92 : x
  2. Step 2: Convert to fraction form
    447.06/670.68 = 138.92/x
  3. Step 3: Cross multiply
    447.06x = 670.68 × 138.92
  4. Step 4: Simplify right side
    447.06x = 93,167.51
  5. Step 5: Solve for x
    x = 93,167.51/447.06
  6. Step 6: Final answer
    x = 208.40

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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.