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Finding the Fourth Proportional to 620.06, 855.51 and 488.66

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Solution

The fourth proportional to 620.06, 855.51 and 488.66 is: 674.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.06 : 855.51 = 488.66 : x
  2. Step 2: Convert to fraction form
    620.06/855.51 = 488.66/x
  3. Step 3: Cross multiply
    620.06x = 855.51 × 488.66
  4. Step 4: Simplify right side
    620.06x = 418,053.52
  5. Step 5: Solve for x
    x = 418,053.52/620.06
  6. Step 6: Final answer
    x = 674.21

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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.