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Finding the Fourth Proportional to 373.28, 515.31 and 290.21

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Solution

The fourth proportional to 373.28, 515.31 and 290.21 is: 400.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    373.28 : 515.31 = 290.21 : x
  2. Step 2: Convert to fraction form
    373.28/515.31 = 290.21/x
  3. Step 3: Cross multiply
    373.28x = 515.31 × 290.21
  4. Step 4: Simplify right side
    373.28x = 149,548.12
  5. Step 5: Solve for x
    x = 149,548.12/373.28
  6. Step 6: Final answer
    x = 400.63

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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.