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Finding the Fourth Proportional to 620.40, 855.70 and 472.68

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Solution

The fourth proportional to 620.40, 855.70 and 472.68 is: 651.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.40 : 855.70 = 472.68 : x
  2. Step 2: Convert to fraction form
    620.40/855.70 = 472.68/x
  3. Step 3: Cross multiply
    620.40x = 855.70 × 472.68
  4. Step 4: Simplify right side
    620.40x = 404,472.28
  5. Step 5: Solve for x
    x = 404,472.28/620.40
  6. Step 6: Final answer
    x = 651.95

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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.