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Finding the Fourth Proportional to 210,419.80, 315,629.70 and 131,776.60

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Solution

The fourth proportional to 210,419.80, 315,629.70 and 131,776.60 is: 197,664.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,419.80 : 315,629.70 = 131,776.60 : x
  2. Step 2: Convert to fraction form
    210,419.80/315,629.70 = 131,776.60/x
  3. Step 3: Cross multiply
    210,419.80x = 315,629.70 × 131,776.60
  4. Step 4: Simplify right side
    210,419.80x = 41,592,608,725.02
  5. Step 5: Solve for x
    x = 41,592,608,725.02/210,419.80
  6. Step 6: Final answer
    x = 197,664.90

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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.