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Finding the Fourth Proportional to 426.15, 587.55 and 308.31

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Solution

The fourth proportional to 426.15, 587.55 and 308.31 is: 425.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.15 : 587.55 = 308.31 : x
  2. Step 2: Convert to fraction form
    426.15/587.55 = 308.31/x
  3. Step 3: Cross multiply
    426.15x = 587.55 × 308.31
  4. Step 4: Simplify right side
    426.15x = 181,147.54
  5. Step 5: Solve for x
    x = 181,147.54/426.15
  6. Step 6: Final answer
    x = 425.08

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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.