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Finding the Fourth Proportional to 418.83, 628.05 and 213.51

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Solution

The fourth proportional to 418.83, 628.05 and 213.51 is: 320.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.83 : 628.05 = 213.51 : x
  2. Step 2: Convert to fraction form
    418.83/628.05 = 213.51/x
  3. Step 3: Cross multiply
    418.83x = 628.05 × 213.51
  4. Step 4: Simplify right side
    418.83x = 134,094.96
  5. Step 5: Solve for x
    x = 134,094.96/418.83
  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.