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Finding the Fourth Proportional to 210,057.20, 315,085.80 and 76,893.20

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Solution

The fourth proportional to 210,057.20, 315,085.80 and 76,893.20 is: 115,339.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,057.20 : 315,085.80 = 76,893.20 : x
  2. Step 2: Convert to fraction form
    210,057.20/315,085.80 = 76,893.20/x
  3. Step 3: Cross multiply
    210,057.20x = 315,085.80 × 76,893.20
  4. Step 4: Simplify right side
    210,057.20x = 24,227,955,436.56
  5. Step 5: Solve for x
    x = 24,227,955,436.56/210,057.20
  6. Step 6: Final answer
    x = 115,339.80

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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.