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Finding the Third Proportional to 851.50 and 1,057

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Solution

The third proportional to 851.50 and 1,057 is: 1,312.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.50 : 1,057 = 1,057 : x
  2. Step 2: Convert to fraction form
    851.50/1,057 = 1,057/x
  3. Step 3: Cross multiply
    851.50x = 1,057 × 1,057
  4. Step 4: Simplify right side
    851.50x = 1,117,249
  5. Step 5: Solve for x
    x = 1,117,249/851.50
  6. Step 6: Final answer
    x = 1,312.10

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Why These Related Problems?

These problems maintain the same ratio (1.24) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.