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Finding the Fourth Proportional to 13,842.88, 20,715.60 and 11,918.32

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Solution

The fourth proportional to 13,842.88, 20,715.60 and 11,918.32 is: 17,835.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,842.88 : 20,715.60 = 11,918.32 : x
  2. Step 2: Convert to fraction form
    13,842.88/20,715.60 = 11,918.32/x
  3. Step 3: Cross multiply
    13,842.88x = 20,715.60 × 11,918.32
  4. Step 4: Simplify right side
    13,842.88x = 246,895,149.79
  5. Step 5: Solve for x
    x = 246,895,149.79/13,842.88
  6. Step 6: Final answer
    x = 17,835.53

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.