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Finding the Fourth Proportional to 620.18, 855.69 and 387.26

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Solution

The fourth proportional to 620.18, 855.69 and 387.26 is: 534.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.18 : 855.69 = 387.26 : x
  2. Step 2: Convert to fraction form
    620.18/855.69 = 387.26/x
  3. Step 3: Cross multiply
    620.18x = 855.69 × 387.26
  4. Step 4: Simplify right side
    620.18x = 331,374.51
  5. Step 5: Solve for x
    x = 331,374.51/620.18
  6. Step 6: Final answer
    x = 534.32

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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.