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Finding the Fourth Proportional to 620.99, 857.04 and 359

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Solution

The fourth proportional to 620.99, 857.04 and 359 is: 495.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.99 : 857.04 = 359 : x
  2. Step 2: Convert to fraction form
    620.99/857.04 = 359/x
  3. Step 3: Cross multiply
    620.99x = 857.04 × 359
  4. Step 4: Simplify right side
    620.99x = 307,677.36
  5. Step 5: Solve for x
    x = 307,677.36/620.99
  6. Step 6: Final answer
    x = 495.46

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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.