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Finding the Fourth Proportional to 13,921.61, 19,211.81 and 7,953.15

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Solution

The fourth proportional to 13,921.61, 19,211.81 and 7,953.15 is: 10,975.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,921.61 : 19,211.81 = 7,953.15 : x
  2. Step 2: Convert to fraction form
    13,921.61/19,211.81 = 7,953.15/x
  3. Step 3: Cross multiply
    13,921.61x = 19,211.81 × 7,953.15
  4. Step 4: Simplify right side
    13,921.61x = 152,794,438.98
  5. Step 5: Solve for x
    x = 152,794,438.98/13,921.61
  6. Step 6: Final answer
    x = 10,975.35

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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.