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Finding the Fourth Proportional to 13,619.54, 18,805.47 and 10,978.74

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Solution

The fourth proportional to 13,619.54, 18,805.47 and 10,978.74 is: 15,159.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,619.54 : 18,805.47 = 10,978.74 : x
  2. Step 2: Convert to fraction form
    13,619.54/18,805.47 = 10,978.74/x
  3. Step 3: Cross multiply
    13,619.54x = 18,805.47 × 10,978.74
  4. Step 4: Simplify right side
    13,619.54x = 206,460,324.54
  5. Step 5: Solve for x
    x = 206,460,324.54/13,619.54
  6. Step 6: Final answer
    x = 15,159.12

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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.