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Finding the Third Proportional to 870.19 and 1,791

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Solution

The third proportional to 870.19 and 1,791 is: 3,686.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    870.19 : 1,791 = 1,791 : x
  2. Step 2: Convert to fraction form
    870.19/1,791 = 1,791/x
  3. Step 3: Cross multiply
    870.19x = 1,791 × 1,791
  4. Step 4: Simplify right side
    870.19x = 3,207,681
  5. Step 5: Solve for x
    x = 3,207,681/870.19
  6. Step 6: Final answer
    x = 3,686.20

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Why These Related Problems?

These problems maintain the same ratio (2.06) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.