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Finding the Third Proportional to 434.63 and 643.88

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Solution

The third proportional to 434.63 and 643.88 is: 953.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    434.63 : 643.88 = 643.88 : x
  2. Step 2: Convert to fraction form
    434.63/643.88 = 643.88/x
  3. Step 3: Cross multiply
    434.63x = 643.88 × 643.88
  4. Step 4: Simplify right side
    434.63x = 414,575.02
  5. Step 5: Solve for x
    x = 414,575.02/434.63
  6. Step 6: Final answer
    x = 953.87

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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.