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Finding the Fourth Proportional to 620.14, 855.78 and 340.38

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Solution

The fourth proportional to 620.14, 855.78 and 340.38 is: 469.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.14 : 855.78 = 340.38 : x
  2. Step 2: Convert to fraction form
    620.14/855.78 = 340.38/x
  3. Step 3: Cross multiply
    620.14x = 855.78 × 340.38
  4. Step 4: Simplify right side
    620.14x = 291,290.40
  5. Step 5: Solve for x
    x = 291,290.40/620.14
  6. Step 6: Final answer
    x = 469.72

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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.