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Finding the Fourth Proportional to 621.91, 858.44 and 373.42

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Solution

The fourth proportional to 621.91, 858.44 and 373.42 is: 515.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.91 : 858.44 = 373.42 : x
  2. Step 2: Convert to fraction form
    621.91/858.44 = 373.42/x
  3. Step 3: Cross multiply
    621.91x = 858.44 × 373.42
  4. Step 4: Simplify right side
    621.91x = 320,556.80
  5. Step 5: Solve for x
    x = 320,556.80/621.91
  6. Step 6: Final answer
    x = 515.44

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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.