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Finding the Fourth Proportional to 426.11, 631.17 and 421.25

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Solution

The fourth proportional to 426.11, 631.17 and 421.25 is: 623.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.11 : 631.17 = 421.25 : x
  2. Step 2: Convert to fraction form
    426.11/631.17 = 421.25/x
  3. Step 3: Cross multiply
    426.11x = 631.17 × 421.25
  4. Step 4: Simplify right side
    426.11x = 265,877.21
  5. Step 5: Solve for x
    x = 265,877.21/426.11
  6. Step 6: Final answer
    x = 623.97

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Why These Related Problems?

These problems maintain the same ratio (1.48) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.