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Finding the Fourth Proportional to 13,668.17, 20,427.36 and 9,978.17

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Solution

The fourth proportional to 13,668.17, 20,427.36 and 9,978.17 is: 14,912.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,668.17 : 20,427.36 = 9,978.17 : x
  2. Step 2: Convert to fraction form
    13,668.17/20,427.36 = 9,978.17/x
  3. Step 3: Cross multiply
    13,668.17x = 20,427.36 × 9,978.17
  4. Step 4: Simplify right side
    13,668.17x = 203,827,568.59
  5. Step 5: Solve for x
    x = 203,827,568.59/13,668.17
  6. Step 6: Final answer
    x = 14,912.58

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.