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Finding the Third Proportional to 390 and 889.50

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Solution

The third proportional to 390 and 889.50 is: 2,028.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    390 : 889.50 = 889.50 : x
  2. Step 2: Convert to fraction form
    390/889.50 = 889.50/x
  3. Step 3: Cross multiply
    390x = 889.50 × 889.50
  4. Step 4: Simplify right side
    390x = 791,210.25
  5. Step 5: Solve for x
    x = 791,210.25/390
  6. Step 6: Final answer
    x = 2,028.74

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Why These Related Problems?

These problems maintain the same ratio (2.28) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.