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Finding the Fourth Proportional to 394.80, 543.40 and 278.16

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Solution

The fourth proportional to 394.80, 543.40 and 278.16 is: 382.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.80 : 543.40 = 278.16 : x
  2. Step 2: Convert to fraction form
    394.80/543.40 = 278.16/x
  3. Step 3: Cross multiply
    394.80x = 543.40 × 278.16
  4. Step 4: Simplify right side
    394.80x = 151,152.14
  5. Step 5: Solve for x
    x = 151,152.14/394.80
  6. Step 6: Final answer
    x = 382.86

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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.