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Finding the Third Proportional to 429.75 and 714.38

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Solution

The third proportional to 429.75 and 714.38 is: 1,187.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    429.75 : 714.38 = 714.38 : x
  2. Step 2: Convert to fraction form
    429.75/714.38 = 714.38/x
  3. Step 3: Cross multiply
    429.75x = 714.38 × 714.38
  4. Step 4: Simplify right side
    429.75x = 510,331.64
  5. Step 5: Solve for x
    x = 510,331.64/429.75
  6. Step 6: Final answer
    x = 1,187.51

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Why These Related Problems?

These problems maintain the same ratio (1.66) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.