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Finding the Fourth Proportional to 621.48, 857.68 and 355.98

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Solution

The fourth proportional to 621.48, 857.68 and 355.98 is: 491.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.48 : 857.68 = 355.98 : x
  2. Step 2: Convert to fraction form
    621.48/857.68 = 355.98/x
  3. Step 3: Cross multiply
    621.48x = 857.68 × 355.98
  4. Step 4: Simplify right side
    621.48x = 305,316.93
  5. Step 5: Solve for x
    x = 305,316.93/621.48
  6. Step 6: Final answer
    x = 491.27

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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.