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Finding the Fourth Proportional to 13,699.12, 18,905 and 8,110.12

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Solution

The fourth proportional to 13,699.12, 18,905 and 8,110.12 is: 11,192.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,699.12 : 18,905 = 8,110.12 : x
  2. Step 2: Convert to fraction form
    13,699.12/18,905 = 8,110.12/x
  3. Step 3: Cross multiply
    13,699.12x = 18,905 × 8,110.12
  4. Step 4: Simplify right side
    13,699.12x = 153,321,818.60
  5. Step 5: Solve for x
    x = 153,321,818.60/13,699.12
  6. Step 6: Final answer
    x = 11,192.09

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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.