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Finding the Fourth Proportional to 69,763.78, 104,645.68 and 20,515.78

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Solution

The fourth proportional to 69,763.78, 104,645.68 and 20,515.78 is: 30,773.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    69,763.78 : 104,645.68 = 20,515.78 : x
  2. Step 2: Convert to fraction form
    69,763.78/104,645.68 = 20,515.78/x
  3. Step 3: Cross multiply
    69,763.78x = 104,645.68 × 20,515.78
  4. Step 4: Simplify right side
    69,763.78x = 2,146,887,828.35
  5. Step 5: Solve for x
    x = 2,146,887,828.35/69,763.78
  6. Step 6: Final answer
    x = 30,773.67

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Similar ratio
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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.