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Finding the Fourth Proportional to 66,078.34, 99,120.56 and 18,697

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Solution

The fourth proportional to 66,078.34, 99,120.56 and 18,697 is: 28,046.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,078.34 : 99,120.56 = 18,697 : x
  2. Step 2: Convert to fraction form
    66,078.34/99,120.56 = 18,697/x
  3. Step 3: Cross multiply
    66,078.34x = 99,120.56 × 18,697
  4. Step 4: Simplify right side
    66,078.34x = 1,853,257,110.32
  5. Step 5: Solve for x
    x = 1,853,257,110.32/66,078.34
  6. Step 6: Final answer
    x = 28,046.36

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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.