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Finding the Fourth Proportional to 13,170.78, 19,707.63 and 7,908.99

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Solution

The fourth proportional to 13,170.78, 19,707.63 and 7,908.99 is: 11,834.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,170.78 : 19,707.63 = 7,908.99 : x
  2. Step 2: Convert to fraction form
    13,170.78/19,707.63 = 7,908.99/x
  3. Step 3: Cross multiply
    13,170.78x = 19,707.63 × 7,908.99
  4. Step 4: Simplify right side
    13,170.78x = 155,867,448.59
  5. Step 5: Solve for x
    x = 155,867,448.59/13,170.78
  6. Step 6: Final answer
    x = 11,834.34

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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.