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Finding the Fourth Proportional to 7,889.39, 11,812.53 and 7,680.26

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Solution

The fourth proportional to 7,889.39, 11,812.53 and 7,680.26 is: 11,499.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,889.39 : 11,812.53 = 7,680.26 : x
  2. Step 2: Convert to fraction form
    7,889.39/11,812.53 = 7,680.26/x
  3. Step 3: Cross multiply
    7,889.39x = 11,812.53 × 7,680.26
  4. Step 4: Simplify right side
    7,889.39x = 90,723,301.66
  5. Step 5: Solve for x
    x = 90,723,301.66/7,889.39
  6. Step 6: Final answer
    x = 11,499.41

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1.5x scale

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.