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Finding the Fourth Proportional to 621.99, 858.24 and 373.28

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Solution

The fourth proportional to 621.99, 858.24 and 373.28 is: 515.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.99 : 858.24 = 373.28 : x
  2. Step 2: Convert to fraction form
    621.99/858.24 = 373.28/x
  3. Step 3: Cross multiply
    621.99x = 858.24 × 373.28
  4. Step 4: Simplify right side
    621.99x = 320,359.54
  5. Step 5: Solve for x
    x = 320,359.54/621.99
  6. Step 6: Final answer
    x = 515.06

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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.