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Finding the Fourth Proportional to 426.47, 642.77 and 403.79

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Solution

The fourth proportional to 426.47, 642.77 and 403.79 is: 608.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.47 : 642.77 = 403.79 : x
  2. Step 2: Convert to fraction form
    426.47/642.77 = 403.79/x
  3. Step 3: Cross multiply
    426.47x = 642.77 × 403.79
  4. Step 4: Simplify right side
    426.47x = 259,540.38
  5. Step 5: Solve for x
    x = 259,540.38/426.47
  6. Step 6: Final answer
    x = 608.59

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.