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Finding the Third Proportional to 420.28 and 859.13

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Solution

The third proportional to 420.28 and 859.13 is: 1,756.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    420.28 : 859.13 = 859.13 : x
  2. Step 2: Convert to fraction form
    420.28/859.13 = 859.13/x
  3. Step 3: Cross multiply
    420.28x = 859.13 × 859.13
  4. Step 4: Simplify right side
    420.28x = 738,095.77
  5. Step 5: Solve for x
    x = 738,095.77/420.28
  6. Step 6: Final answer
    x = 1,756.19

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Why These Related Problems?

These problems maintain the same ratio (2.04) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.