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Finding the Third Proportional to 387.50 and 829.50

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Solution

The third proportional to 387.50 and 829.50 is: 1,775.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.50 : 829.50 = 829.50 : x
  2. Step 2: Convert to fraction form
    387.50/829.50 = 829.50/x
  3. Step 3: Cross multiply
    387.50x = 829.50 × 829.50
  4. Step 4: Simplify right side
    387.50x = 688,070.25
  5. Step 5: Solve for x
    x = 688,070.25/387.50
  6. Step 6: Final answer
    x = 1,775.67

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Why These Related Problems?

These problems maintain the same ratio (2.14) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.