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Finding the Fourth Proportional to 488.40, 672.96 and 394.80

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Solution

The fourth proportional to 488.40, 672.96 and 394.80 is: 543.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    488.40 : 672.96 = 394.80 : x
  2. Step 2: Convert to fraction form
    488.40/672.96 = 394.80/x
  3. Step 3: Cross multiply
    488.40x = 672.96 × 394.80
  4. Step 4: Simplify right side
    488.40x = 265,684.61
  5. Step 5: Solve for x
    x = 265,684.61/488.40
  6. Step 6: Final answer
    x = 543.99

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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.