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Finding the Fourth Proportional to 143,651.93, 215,405.79 and 83,699.78

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Solution

The fourth proportional to 143,651.93, 215,405.79 and 83,699.78 is: 125,507.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,651.93 : 215,405.79 = 83,699.78 : x
  2. Step 2: Convert to fraction form
    143,651.93/215,405.79 = 83,699.78/x
  3. Step 3: Cross multiply
    143,651.93x = 215,405.79 × 83,699.78
  4. Step 4: Simplify right side
    143,651.93x = 18,029,416,156.70
  5. Step 5: Solve for x
    x = 18,029,416,156.70/143,651.93
  6. Step 6: Final answer
    x = 125,507.65

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.