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Finding the Fourth Proportional to 620.43, 853.65 and 472.20

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Solution

The fourth proportional to 620.43, 853.65 and 472.20 is: 649.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.43 : 853.65 = 472.20 : x
  2. Step 2: Convert to fraction form
    620.43/853.65 = 472.20/x
  3. Step 3: Cross multiply
    620.43x = 853.65 × 472.20
  4. Step 4: Simplify right side
    620.43x = 403,093.53
  5. Step 5: Solve for x
    x = 403,093.53/620.43
  6. Step 6: Final answer
    x = 649.70

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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.