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Finding the Fourth Proportional to 393.42, 543.18 and 275.34

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Solution

The fourth proportional to 393.42, 543.18 and 275.34 is: 380.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.42 : 543.18 = 275.34 : x
  2. Step 2: Convert to fraction form
    393.42/543.18 = 275.34/x
  3. Step 3: Cross multiply
    393.42x = 543.18 × 275.34
  4. Step 4: Simplify right side
    393.42x = 149,559.18
  5. Step 5: Solve for x
    x = 149,559.18/393.42
  6. Step 6: Final answer
    x = 380.15

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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.