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Finding the Fourth Proportional to 620.58, 855.72 and 571.98

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Solution

The fourth proportional to 620.58, 855.72 and 571.98 is: 788.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.58 : 855.72 = 571.98 : x
  2. Step 2: Convert to fraction form
    620.58/855.72 = 571.98/x
  3. Step 3: Cross multiply
    620.58x = 855.72 × 571.98
  4. Step 4: Simplify right side
    620.58x = 489,454.73
  5. Step 5: Solve for x
    x = 489,454.73/620.58
  6. Step 6: Final answer
    x = 788.71

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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.