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Finding the Fourth Proportional to 393.36, 539.94 and 358.80

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Solution

The fourth proportional to 393.36, 539.94 and 358.80 is: 492.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.36 : 539.94 = 358.80 : x
  2. Step 2: Convert to fraction form
    393.36/539.94 = 358.80/x
  3. Step 3: Cross multiply
    393.36x = 539.94 × 358.80
  4. Step 4: Simplify right side
    393.36x = 193,730.47
  5. Step 5: Solve for x
    x = 193,730.47/393.36
  6. Step 6: Final answer
    x = 492.50

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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.