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Finding the Fourth Proportional to 621.42, 857.15 and 372.57

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Solution

The fourth proportional to 621.42, 857.15 and 372.57 is: 513.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.42 : 857.15 = 372.57 : x
  2. Step 2: Convert to fraction form
    621.42/857.15 = 372.57/x
  3. Step 3: Cross multiply
    621.42x = 857.15 × 372.57
  4. Step 4: Simplify right side
    621.42x = 319,346.51
  5. Step 5: Solve for x
    x = 319,346.51/621.42
  6. Step 6: Final answer
    x = 513.90

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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.