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Finding the Fourth Proportional to 394.80, 543.72 and 348.24

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Solution

The fourth proportional to 394.80, 543.72 and 348.24 is: 479.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.80 : 543.72 = 348.24 : x
  2. Step 2: Convert to fraction form
    394.80/543.72 = 348.24/x
  3. Step 3: Cross multiply
    394.80x = 543.72 × 348.24
  4. Step 4: Simplify right side
    394.80x = 189,345.05
  5. Step 5: Solve for x
    x = 189,345.05/394.80
  6. Step 6: Final answer
    x = 479.60

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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.