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Finding the Fourth Proportional to 393.40, 540.45 and 352.50

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Solution

The fourth proportional to 393.40, 540.45 and 352.50 is: 484.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.40 : 540.45 = 352.50 : x
  2. Step 2: Convert to fraction form
    393.40/540.45 = 352.50/x
  3. Step 3: Cross multiply
    393.40x = 540.45 × 352.50
  4. Step 4: Simplify right side
    393.40x = 190,508.63
  5. Step 5: Solve for x
    x = 190,508.63/393.40
  6. Step 6: Final answer
    x = 484.26

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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.