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Finding the Fourth Proportional to 61,005.79, 91,511.94 and 18,914.95

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Solution

The fourth proportional to 61,005.79, 91,511.94 and 18,914.95 is: 28,373.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,005.79 : 91,511.94 = 18,914.95 : x
  2. Step 2: Convert to fraction form
    61,005.79/91,511.94 = 18,914.95/x
  3. Step 3: Cross multiply
    61,005.79x = 91,511.94 × 18,914.95
  4. Step 4: Simplify right side
    61,005.79x = 1,730,943,954.82
  5. Step 5: Solve for x
    x = 1,730,943,954.82/61,005.79
  6. Step 6: Final answer
    x = 28,373.44

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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.