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Finding the Fourth Proportional to 143,011.80, 197,361.57 and 78,483.03

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Solution

The fourth proportional to 143,011.80, 197,361.57 and 78,483.03 is: 108,309.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,011.80 : 197,361.57 = 78,483.03 : x
  2. Step 2: Convert to fraction form
    143,011.80/197,361.57 = 78,483.03/x
  3. Step 3: Cross multiply
    143,011.80x = 197,361.57 × 78,483.03
  4. Step 4: Simplify right side
    143,011.80x = 15,489,534,019.16
  5. Step 5: Solve for x
    x = 15,489,534,019.16/143,011.80
  6. Step 6: Final answer
    x = 108,309.48

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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.