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Finding the Fourth Proportional to 456.82, 685.55 and 213.35

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Solution

The fourth proportional to 456.82, 685.55 and 213.35 is: 320.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    456.82 : 685.55 = 213.35 : x
  2. Step 2: Convert to fraction form
    456.82/685.55 = 213.35/x
  3. Step 3: Cross multiply
    456.82x = 685.55 × 213.35
  4. Step 4: Simplify right side
    456.82x = 146,259.20
  5. Step 5: Solve for x
    x = 146,259.20/456.82
  6. Step 6: Final answer
    x = 320.17

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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.