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Finding the Fourth Proportional to 393.04, 539.21 and 368.20

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Solution

The fourth proportional to 393.04, 539.21 and 368.20 is: 505.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.04 : 539.21 = 368.20 : x
  2. Step 2: Convert to fraction form
    393.04/539.21 = 368.20/x
  3. Step 3: Cross multiply
    393.04x = 539.21 × 368.20
  4. Step 4: Simplify right side
    393.04x = 198,537.12
  5. Step 5: Solve for x
    x = 198,537.12/393.04
  6. Step 6: Final answer
    x = 505.13

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.