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Finding the Fourth Proportional to 426.04, 638.98 and 191.77

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Solution

The fourth proportional to 426.04, 638.98 and 191.77 is: 287.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.04 : 638.98 = 191.77 : x
  2. Step 2: Convert to fraction form
    426.04/638.98 = 191.77/x
  3. Step 3: Cross multiply
    426.04x = 638.98 × 191.77
  4. Step 4: Simplify right side
    426.04x = 122,537.19
  5. Step 5: Solve for x
    x = 122,537.19/426.04
  6. Step 6: Final answer
    x = 287.62

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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.