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Finding the Fourth Proportional to 13,920.36, 19,209 and 7,951.20

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Solution

The fourth proportional to 13,920.36, 19,209 and 7,951.20 is: 10,972.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,920.36 : 19,209 = 7,951.20 : x
  2. Step 2: Convert to fraction form
    13,920.36/19,209 = 7,951.20/x
  3. Step 3: Cross multiply
    13,920.36x = 19,209 × 7,951.20
  4. Step 4: Simplify right side
    13,920.36x = 152,734,600.80
  5. Step 5: Solve for x
    x = 152,734,600.80/13,920.36
  6. Step 6: Final answer
    x = 10,972.03

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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.