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Finding the Fourth Proportional to 207,421.40, 311,285.70 and 82,851.80

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Solution

The fourth proportional to 207,421.40, 311,285.70 and 82,851.80 is: 124,339.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    207,421.40 : 311,285.70 = 82,851.80 : x
  2. Step 2: Convert to fraction form
    207,421.40/311,285.70 = 82,851.80/x
  3. Step 3: Cross multiply
    207,421.40x = 311,285.70 × 82,851.80
  4. Step 4: Simplify right side
    207,421.40x = 25,790,580,559.26
  5. Step 5: Solve for x
    x = 25,790,580,559.26/207,421.40
  6. Step 6: Final answer
    x = 124,339.05

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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.