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Finding the Fourth Proportional to 18,764.88, 25,889.67 and 11,312.88

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Solution

The fourth proportional to 18,764.88, 25,889.67 and 11,312.88 is: 15,608.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,764.88 : 25,889.67 = 11,312.88 : x
  2. Step 2: Convert to fraction form
    18,764.88/25,889.67 = 11,312.88/x
  3. Step 3: Cross multiply
    18,764.88x = 25,889.67 × 11,312.88
  4. Step 4: Simplify right side
    18,764.88x = 292,886,729.95
  5. Step 5: Solve for x
    x = 292,886,729.95/18,764.88
  6. Step 6: Final answer
    x = 15,608.24

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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.