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Finding the Fourth Proportional to 620.66, 855.96 and 555.86

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Solution

The fourth proportional to 620.66, 855.96 and 555.86 is: 766.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.66 : 855.96 = 555.86 : x
  2. Step 2: Convert to fraction form
    620.66/855.96 = 555.86/x
  3. Step 3: Cross multiply
    620.66x = 855.96 × 555.86
  4. Step 4: Simplify right side
    620.66x = 475,793.93
  5. Step 5: Solve for x
    x = 475,793.93/620.66
  6. Step 6: Final answer
    x = 766.59

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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.