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Finding the Third Proportional to 428.50 and 928

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Solution

The third proportional to 428.50 and 928 is: 2,009.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    428.50 : 928 = 928 : x
  2. Step 2: Convert to fraction form
    428.50/928 = 928/x
  3. Step 3: Cross multiply
    428.50x = 928 × 928
  4. Step 4: Simplify right side
    428.50x = 861,184
  5. Step 5: Solve for x
    x = 861,184/428.50
  6. Step 6: Final answer
    x = 2,009.76

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Why These Related Problems?

These problems maintain the same ratio (2.17) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.