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Finding the Fourth Proportional to 13,879.72, 19,151.78 and 7,911.40

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Solution

The fourth proportional to 13,879.72, 19,151.78 and 7,911.40 is: 10,916.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,879.72 : 19,151.78 = 7,911.40 : x
  2. Step 2: Convert to fraction form
    13,879.72/19,151.78 = 7,911.40/x
  3. Step 3: Cross multiply
    13,879.72x = 19,151.78 × 7,911.40
  4. Step 4: Simplify right side
    13,879.72x = 151,517,392.29
  5. Step 5: Solve for x
    x = 151,517,392.29/13,879.72
  6. Step 6: Final answer
    x = 10,916.46

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.