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Finding the Fourth Proportional to 13,979.28, 20,859.92 and 12,737.28

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Solution

The fourth proportional to 13,979.28, 20,859.92 and 12,737.28 is: 19,006.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,979.28 : 20,859.92 = 12,737.28 : x
  2. Step 2: Convert to fraction form
    13,979.28/20,859.92 = 12,737.28/x
  3. Step 3: Cross multiply
    13,979.28x = 20,859.92 × 12,737.28
  4. Step 4: Simplify right side
    13,979.28x = 265,698,641.82
  5. Step 5: Solve for x
    x = 265,698,641.82/13,979.28
  6. Step 6: Final answer
    x = 19,006.60

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.