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Finding the Fourth Proportional to 620.13, 855.74 and 340.31

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Solution

The fourth proportional to 620.13, 855.74 and 340.31 is: 469.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.13 : 855.74 = 340.31 : x
  2. Step 2: Convert to fraction form
    620.13/855.74 = 340.31/x
  3. Step 3: Cross multiply
    620.13x = 855.74 × 340.31
  4. Step 4: Simplify right side
    620.13x = 291,219.87
  5. Step 5: Solve for x
    x = 291,219.87/620.13
  6. Step 6: Final answer
    x = 469.61

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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.