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Finding the Fourth Proportional to 620.99, 857 and 372.32

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Solution

The fourth proportional to 620.99, 857 and 372.32 is: 513.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.99 : 857 = 372.32 : x
  2. Step 2: Convert to fraction form
    620.99/857 = 372.32/x
  3. Step 3: Cross multiply
    620.99x = 857 × 372.32
  4. Step 4: Simplify right side
    620.99x = 319,078.24
  5. Step 5: Solve for x
    x = 319,078.24/620.99
  6. Step 6: Final answer
    x = 513.82

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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.