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Finding the Third Proportional to 765 and 1,120.50

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Solution

The third proportional to 765 and 1,120.50 is: 1,641.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    765 : 1,120.50 = 1,120.50 : x
  2. Step 2: Convert to fraction form
    765/1,120.50 = 1,120.50/x
  3. Step 3: Cross multiply
    765x = 1,120.50 × 1,120.50
  4. Step 4: Simplify right side
    765x = 1,255,520.25
  5. Step 5: Solve for x
    x = 1,255,520.25/765
  6. Step 6: Final answer
    x = 1,641.20

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Why These Related Problems?

These problems maintain the same ratio (1.46) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.