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Finding the Fourth Proportional to 622.80, 857.79 and 539.91

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Solution

The fourth proportional to 622.80, 857.79 and 539.91 is: 743.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    622.80 : 857.79 = 539.91 : x
  2. Step 2: Convert to fraction form
    622.80/857.79 = 539.91/x
  3. Step 3: Cross multiply
    622.80x = 857.79 × 539.91
  4. Step 4: Simplify right side
    622.80x = 463,129.40
  5. Step 5: Solve for x
    x = 463,129.40/622.80
  6. Step 6: Final answer
    x = 743.62

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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.