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Finding the Fourth Proportional to 393.66, 543.03 and 281.52

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Solution

The fourth proportional to 393.66, 543.03 and 281.52 is: 388.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.66 : 543.03 = 281.52 : x
  2. Step 2: Convert to fraction form
    393.66/543.03 = 281.52/x
  3. Step 3: Cross multiply
    393.66x = 543.03 × 281.52
  4. Step 4: Simplify right side
    393.66x = 152,873.81
  5. Step 5: Solve for x
    x = 152,873.81/393.66
  6. Step 6: Final answer
    x = 388.34

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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.