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Finding the Fourth Proportional to 143,520.94, 198,052.14 and 78,988.06

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Solution

The fourth proportional to 143,520.94, 198,052.14 and 78,988.06 is: 108,999.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,520.94 : 198,052.14 = 78,988.06 : x
  2. Step 2: Convert to fraction form
    143,520.94/198,052.14 = 78,988.06/x
  3. Step 3: Cross multiply
    143,520.94x = 198,052.14 × 78,988.06
  4. Step 4: Simplify right side
    143,520.94x = 15,643,754,317.45
  5. Step 5: Solve for x
    x = 15,643,754,317.45/143,520.94
  6. Step 6: Final answer
    x = 108,999.80

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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.