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Finding the Third Proportional to 405 and 875.81

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Solution

The third proportional to 405 and 875.81 is: 1,893.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    405 : 875.81 = 875.81 : x
  2. Step 2: Convert to fraction form
    405/875.81 = 875.81/x
  3. Step 3: Cross multiply
    405x = 875.81 × 875.81
  4. Step 4: Simplify right side
    405x = 767,047.54
  5. Step 5: Solve for x
    x = 767,047.54/405
  6. Step 6: Final answer
    x = 1,893.94

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Why These Related Problems?

These problems maintain the same ratio (2.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.