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Finding the Fourth Proportional to 2,125.95, 3,188.93 and 665.12

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Solution

The fourth proportional to 2,125.95, 3,188.93 and 665.12 is: 997.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,125.95 : 3,188.93 = 665.12 : x
  2. Step 2: Convert to fraction form
    2,125.95/3,188.93 = 665.12/x
  3. Step 3: Cross multiply
    2,125.95x = 3,188.93 × 665.12
  4. Step 4: Simplify right side
    2,125.95x = 2,121,001.85
  5. Step 5: Solve for x
    x = 2,121,001.85/2,125.95
  6. Step 6: Final answer
    x = 997.67

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.