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Finding the Fourth Proportional to 394.08, 543.60 and 278.16

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Solution

The fourth proportional to 394.08, 543.60 and 278.16 is: 383.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.08 : 543.60 = 278.16 : x
  2. Step 2: Convert to fraction form
    394.08/543.60 = 278.16/x
  3. Step 3: Cross multiply
    394.08x = 543.60 × 278.16
  4. Step 4: Simplify right side
    394.08x = 151,207.78
  5. Step 5: Solve for x
    x = 151,207.78/394.08
  6. Step 6: Final answer
    x = 383.70

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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.