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Finding the Fourth Proportional to 66,129.84, 99,209.28 and 19,383.12

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Solution

The fourth proportional to 66,129.84, 99,209.28 and 19,383.12 is: 29,078.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,129.84 : 99,209.28 = 19,383.12 : x
  2. Step 2: Convert to fraction form
    66,129.84/99,209.28 = 19,383.12/x
  3. Step 3: Cross multiply
    66,129.84x = 99,209.28 × 19,383.12
  4. Step 4: Simplify right side
    66,129.84x = 1,922,985,379.35
  5. Step 5: Solve for x
    x = 1,922,985,379.35/66,129.84
  6. Step 6: Final answer
    x = 29,078.94

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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.