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Finding the Fourth Proportional to 19,663.54, 27,129 and 11,164.78

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Solution

The fourth proportional to 19,663.54, 27,129 and 11,164.78 is: 15,403.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,663.54 : 27,129 = 11,164.78 : x
  2. Step 2: Convert to fraction form
    19,663.54/27,129 = 11,164.78/x
  3. Step 3: Cross multiply
    19,663.54x = 27,129 × 11,164.78
  4. Step 4: Simplify right side
    19,663.54x = 302,889,316.62
  5. Step 5: Solve for x
    x = 302,889,316.62/19,663.54
  6. Step 6: Final answer
    x = 15,403.60

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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.