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Finding the Third Proportional to 803 and 1,289.50

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Solution

The third proportional to 803 and 1,289.50 is: 2,070.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    803 : 1,289.50 = 1,289.50 : x
  2. Step 2: Convert to fraction form
    803/1,289.50 = 1,289.50/x
  3. Step 3: Cross multiply
    803x = 1,289.50 × 1,289.50
  4. Step 4: Simplify right side
    803x = 1,662,810.25
  5. Step 5: Solve for x
    x = 1,662,810.25/803
  6. Step 6: Final answer
    x = 2,070.75

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Why These Related Problems?

These problems maintain the same ratio (1.61) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.