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Finding the Fourth Proportional to 69,311.55, 103,980.19 and 21,938.57

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Solution

The fourth proportional to 69,311.55, 103,980.19 and 21,938.57 is: 32,911.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    69,311.55 : 103,980.19 = 21,938.57 : x
  2. Step 2: Convert to fraction form
    69,311.55/103,980.19 = 21,938.57/x
  3. Step 3: Cross multiply
    69,311.55x = 103,980.19 × 21,938.57
  4. Step 4: Simplify right side
    69,311.55x = 2,281,176,676.93
  5. Step 5: Solve for x
    x = 2,281,176,676.93/69,311.55
  6. Step 6: Final answer
    x = 32,911.93

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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.