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Finding the Fourth Proportional to 620.27, 855.96 and 340.51

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Solution

The fourth proportional to 620.27, 855.96 and 340.51 is: 469.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.27 : 855.96 = 340.51 : x
  2. Step 2: Convert to fraction form
    620.27/855.96 = 340.51/x
  3. Step 3: Cross multiply
    620.27x = 855.96 × 340.51
  4. Step 4: Simplify right side
    620.27x = 291,462.94
  5. Step 5: Solve for x
    x = 291,462.94/620.27
  6. Step 6: Final answer
    x = 469.90

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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.