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Finding the Fourth Proportional to 403.88, 606.84 and 257.70

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Solution

The fourth proportional to 403.88, 606.84 and 257.70 is: 387.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.88 : 606.84 = 257.70 : x
  2. Step 2: Convert to fraction form
    403.88/606.84 = 257.70/x
  3. Step 3: Cross multiply
    403.88x = 606.84 × 257.70
  4. Step 4: Simplify right side
    403.88x = 156,382.67
  5. Step 5: Solve for x
    x = 156,382.67/403.88
  6. Step 6: Final answer
    x = 387.20

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.