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Finding the Fourth Proportional to 103,689.82, 143,018.21 and 69,217.19

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Solution

The fourth proportional to 103,689.82, 143,018.21 and 69,217.19 is: 95,470.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,689.82 : 143,018.21 = 69,217.19 : x
  2. Step 2: Convert to fraction form
    103,689.82/143,018.21 = 69,217.19/x
  3. Step 3: Cross multiply
    103,689.82x = 143,018.21 × 69,217.19
  4. Step 4: Simplify right side
    103,689.82x = 9,899,318,622.19
  5. Step 5: Solve for x
    x = 9,899,318,622.19/103,689.82
  6. Step 6: Final answer
    x = 95,470.50

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.