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Finding the Third Proportional to 431 and 626.25

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Solution

The third proportional to 431 and 626.25 is: 909.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    431 : 626.25 = 626.25 : x
  2. Step 2: Convert to fraction form
    431/626.25 = 626.25/x
  3. Step 3: Cross multiply
    431x = 626.25 × 626.25
  4. Step 4: Simplify right side
    431x = 392,189.06
  5. Step 5: Solve for x
    x = 392,189.06/431
  6. Step 6: Final answer
    x = 909.95

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Why These Related Problems?

These problems maintain the same ratio (1.45) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.