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Finding the Fourth Proportional to 620.22, 854.55 and 412.86

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Solution

The fourth proportional to 620.22, 854.55 and 412.86 is: 568.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.22 : 854.55 = 412.86 : x
  2. Step 2: Convert to fraction form
    620.22/854.55 = 412.86/x
  3. Step 3: Cross multiply
    620.22x = 854.55 × 412.86
  4. Step 4: Simplify right side
    620.22x = 352,809.51
  5. Step 5: Solve for x
    x = 352,809.51/620.22
  6. Step 6: Final answer
    x = 568.85

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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.