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Finding the Fourth Proportional to 18,512.70, 25,548.15 and 10,129.20

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Solution

The fourth proportional to 18,512.70, 25,548.15 and 10,129.20 is: 13,978.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,512.70 : 25,548.15 = 10,129.20 : x
  2. Step 2: Convert to fraction form
    18,512.70/25,548.15 = 10,129.20/x
  3. Step 3: Cross multiply
    18,512.70x = 25,548.15 × 10,129.20
  4. Step 4: Simplify right side
    18,512.70x = 258,782,320.98
  5. Step 5: Solve for x
    x = 258,782,320.98/18,512.70
  6. Step 6: Final answer
    x = 13,978.64

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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.