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Finding the Fourth Proportional to 69,813.76, 103,930.98 and 69,398.57

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Solution

The fourth proportional to 69,813.76, 103,930.98 and 69,398.57 is: 103,312.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    69,813.76 : 103,930.98 = 69,398.57 : x
  2. Step 2: Convert to fraction form
    69,813.76/103,930.98 = 69,398.57/x
  3. Step 3: Cross multiply
    69,813.76x = 103,930.98 × 69,398.57
  4. Step 4: Simplify right side
    69,813.76x = 7,212,660,524.05
  5. Step 5: Solve for x
    x = 7,212,660,524.05/69,813.76
  6. Step 6: Final answer
    x = 103,312.89

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.