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Finding the Fourth Proportional to 617.47, 851.86 and 355.43

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Solution

The fourth proportional to 617.47, 851.86 and 355.43 is: 490.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    617.47 : 851.86 = 355.43 : x
  2. Step 2: Convert to fraction form
    617.47/851.86 = 355.43/x
  3. Step 3: Cross multiply
    617.47x = 851.86 × 355.43
  4. Step 4: Simplify right side
    617.47x = 302,779.17
  5. Step 5: Solve for x
    x = 302,779.17/617.47
  6. Step 6: Final answer
    x = 490.36

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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.