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Finding the Fourth Proportional to 18,670.72, 25,755.72 and 11,111.66

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Solution

The fourth proportional to 18,670.72, 25,755.72 and 11,111.66 is: 15,328.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,670.72 : 25,755.72 = 11,111.66 : x
  2. Step 2: Convert to fraction form
    18,670.72/25,755.72 = 11,111.66/x
  3. Step 3: Cross multiply
    18,670.72x = 25,755.72 × 11,111.66
  4. Step 4: Simplify right side
    18,670.72x = 286,188,803.70
  5. Step 5: Solve for x
    x = 286,188,803.70/18,670.72
  6. Step 6: Final answer
    x = 15,328.22

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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.