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Finding the Fourth Proportional to 13,663.71, 18,858.99 and 8,945.25

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Solution

The fourth proportional to 13,663.71, 18,858.99 and 8,945.25 is: 12,346.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,663.71 : 18,858.99 = 8,945.25 : x
  2. Step 2: Convert to fraction form
    13,663.71/18,858.99 = 8,945.25/x
  3. Step 3: Cross multiply
    13,663.71x = 18,858.99 × 8,945.25
  4. Step 4: Simplify right side
    13,663.71x = 168,698,380.30
  5. Step 5: Solve for x
    x = 168,698,380.30/13,663.71
  6. Step 6: Final answer
    x = 12,346.45

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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.