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Finding the Fourth Proportional to 620.34, 855 and 554.82

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Solution

The fourth proportional to 620.34, 855 and 554.82 is: 764.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.34 : 855 = 554.82 : x
  2. Step 2: Convert to fraction form
    620.34/855 = 554.82/x
  3. Step 3: Cross multiply
    620.34x = 855 × 554.82
  4. Step 4: Simplify right side
    620.34x = 474,371.10
  5. Step 5: Solve for x
    x = 474,371.10/620.34
  6. Step 6: Final answer
    x = 764.70

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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.