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Finding the Fourth Proportional to 379,980.80, 524,371.20 and 210,211.28

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Solution

The fourth proportional to 379,980.80, 524,371.20 and 210,211.28 is: 290,090.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    379,980.80 : 524,371.20 = 210,211.28 : x
  2. Step 2: Convert to fraction form
    379,980.80/524,371.20 = 210,211.28/x
  3. Step 3: Cross multiply
    379,980.80x = 524,371.20 × 210,211.28
  4. Step 4: Simplify right side
    379,980.80x = 110,228,741,147.14
  5. Step 5: Solve for x
    x = 110,228,741,147.14/379,980.80
  6. Step 6: Final answer
    x = 290,090.29

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.