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Finding the Fourth Proportional to 13,728.78, 18,946.50 and 7,760.28

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Solution

The fourth proportional to 13,728.78, 18,946.50 and 7,760.28 is: 10,709.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,728.78 : 18,946.50 = 7,760.28 : x
  2. Step 2: Convert to fraction form
    13,728.78/18,946.50 = 7,760.28/x
  3. Step 3: Cross multiply
    13,728.78x = 18,946.50 × 7,760.28
  4. Step 4: Simplify right side
    13,728.78x = 147,030,145.02
  5. Step 5: Solve for x
    x = 147,030,145.02/13,728.78
  6. Step 6: Final answer
    x = 10,709.63

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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.