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Finding the Third Proportional to 3,155 and 4,678.50

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Solution

The third proportional to 3,155 and 4,678.50 is: 6,937.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,155 : 4,678.50 = 4,678.50 : x
  2. Step 2: Convert to fraction form
    3,155/4,678.50 = 4,678.50/x
  3. Step 3: Cross multiply
    3,155x = 4,678.50 × 4,678.50
  4. Step 4: Simplify right side
    3,155x = 21,888,362.25
  5. Step 5: Solve for x
    x = 21,888,362.25/3,155
  6. Step 6: Final answer
    x = 6,937.67

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Why These Related Problems?

These problems maintain the same ratio (1.48) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.