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Finding the Fourth Proportional to 393.39, 543.18 and 283.13

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Solution

The fourth proportional to 393.39, 543.18 and 283.13 is: 390.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.39 : 543.18 = 283.13 : x
  2. Step 2: Convert to fraction form
    393.39/543.18 = 283.13/x
  3. Step 3: Cross multiply
    393.39x = 543.18 × 283.13
  4. Step 4: Simplify right side
    393.39x = 153,787.84
  5. Step 5: Solve for x
    x = 153,787.84/393.39
  6. Step 6: Final answer
    x = 390.93

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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.