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Finding the Fourth Proportional to 628.17, 865.62 and 418.11

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Solution

The fourth proportional to 628.17, 865.62 and 418.11 is: 576.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.17 : 865.62 = 418.11 : x
  2. Step 2: Convert to fraction form
    628.17/865.62 = 418.11/x
  3. Step 3: Cross multiply
    628.17x = 865.62 × 418.11
  4. Step 4: Simplify right side
    628.17x = 361,924.38
  5. Step 5: Solve for x
    x = 361,924.38/628.17
  6. Step 6: Final answer
    x = 576.16

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.