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Finding the Fourth Proportional to 621.43, 855.03 and 473.20

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Solution

The fourth proportional to 621.43, 855.03 and 473.20 is: 651.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.43 : 855.03 = 473.20 : x
  2. Step 2: Convert to fraction form
    621.43/855.03 = 473.20/x
  3. Step 3: Cross multiply
    621.43x = 855.03 × 473.20
  4. Step 4: Simplify right side
    621.43x = 404,600.20
  5. Step 5: Solve for x
    x = 404,600.20/621.43
  6. Step 6: Final answer
    x = 651.08

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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.