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Finding the Fourth Proportional to 103,890.79, 143,391.58 and 65,626

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Solution

The fourth proportional to 103,890.79, 143,391.58 and 65,626 is: 90,577.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,890.79 : 143,391.58 = 65,626 : x
  2. Step 2: Convert to fraction form
    103,890.79/143,391.58 = 65,626/x
  3. Step 3: Cross multiply
    103,890.79x = 143,391.58 × 65,626
  4. Step 4: Simplify right side
    103,890.79x = 9,410,215,829.08
  5. Step 5: Solve for x
    x = 9,410,215,829.08/103,890.79
  6. Step 6: Final answer
    x = 90,577.96

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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.