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Finding the Fourth Proportional to 208,542.80, 312,814.20 and 129,810.80

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Solution

The fourth proportional to 208,542.80, 312,814.20 and 129,810.80 is: 194,716.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    208,542.80 : 312,814.20 = 129,810.80 : x
  2. Step 2: Convert to fraction form
    208,542.80/312,814.20 = 129,810.80/x
  3. Step 3: Cross multiply
    208,542.80x = 312,814.20 × 129,810.80
  4. Step 4: Simplify right side
    208,542.80x = 40,606,661,553.36
  5. Step 5: Solve for x
    x = 40,606,661,553.36/208,542.80
  6. Step 6: Final answer
    x = 194,716.20

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1.5x scale

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.