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Finding the Fourth Proportional to 620, 855.30 and 371.18

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Solution

The fourth proportional to 620, 855.30 and 371.18 is: 512.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    620 : 855.30 = 371.18 : x
  2. Step 2: Convert to fraction form
    620/855.30 = 371.18/x
  3. Step 3: Cross multiply
    620x = 855.30 × 371.18
  4. Step 4: Simplify right side
    620x = 317,470.25
  5. Step 5: Solve for x
    x = 317,470.25/620
  6. Step 6: Final answer
    x = 512.05

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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.