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Finding the Fourth Proportional to 621.65, 857.80 and 372.94

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Solution

The fourth proportional to 621.65, 857.80 and 372.94 is: 514.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.65 : 857.80 = 372.94 : x
  2. Step 2: Convert to fraction form
    621.65/857.80 = 372.94/x
  3. Step 3: Cross multiply
    621.65x = 857.80 × 372.94
  4. Step 4: Simplify right side
    621.65x = 319,907.93
  5. Step 5: Solve for x
    x = 319,907.93/621.65
  6. Step 6: Final answer
    x = 514.61

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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.