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Finding the Third Proportional to 389.75 and 841.50

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Solution

The third proportional to 389.75 and 841.50 is: 1,816.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.75 : 841.50 = 841.50 : x
  2. Step 2: Convert to fraction form
    389.75/841.50 = 841.50/x
  3. Step 3: Cross multiply
    389.75x = 841.50 × 841.50
  4. Step 4: Simplify right side
    389.75x = 708,122.25
  5. Step 5: Solve for x
    x = 708,122.25/389.75
  6. Step 6: Final answer
    x = 1,816.86

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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.