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Finding the Fourth Proportional to 431.25, 645.26 and 268.17

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Solution

The fourth proportional to 431.25, 645.26 and 268.17 is: 401.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    431.25 : 645.26 = 268.17 : x
  2. Step 2: Convert to fraction form
    431.25/645.26 = 268.17/x
  3. Step 3: Cross multiply
    431.25x = 645.26 × 268.17
  4. Step 4: Simplify right side
    431.25x = 173,038.03
  5. Step 5: Solve for x
    x = 173,038.03/431.25
  6. Step 6: Final answer
    x = 401.25

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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.