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Finding the Third Proportional to 387.56 and 859.13

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Solution

The third proportional to 387.56 and 859.13 is: 1,904.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.56 : 859.13 = 859.13 : x
  2. Step 2: Convert to fraction form
    387.56/859.13 = 859.13/x
  3. Step 3: Cross multiply
    387.56x = 859.13 × 859.13
  4. Step 4: Simplify right side
    387.56x = 738,095.77
  5. Step 5: Solve for x
    x = 738,095.77/387.56
  6. Step 6: Final answer
    x = 1,904.46

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Why These Related Problems?

These problems maintain the same ratio (2.22) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.