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Finding the Fourth Proportional to 620.70, 854.73 and 445.74

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Solution

The fourth proportional to 620.70, 854.73 and 445.74 is: 613.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.70 : 854.73 = 445.74 : x
  2. Step 2: Convert to fraction form
    620.70/854.73 = 445.74/x
  3. Step 3: Cross multiply
    620.70x = 854.73 × 445.74
  4. Step 4: Simplify right side
    620.70x = 380,987.35
  5. Step 5: Solve for x
    x = 380,987.35/620.70
  6. Step 6: Final answer
    x = 613.80

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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.