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Finding the Fourth Proportional to 275,868.36, 380,709.60 and 155,009.28

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Solution

The fourth proportional to 275,868.36, 380,709.60 and 155,009.28 is: 213,919.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    275,868.36 : 380,709.60 = 155,009.28 : x
  2. Step 2: Convert to fraction form
    275,868.36/380,709.60 = 155,009.28/x
  3. Step 3: Cross multiply
    275,868.36x = 380,709.60 × 155,009.28
  4. Step 4: Simplify right side
    275,868.36x = 59,013,520,985.09
  5. Step 5: Solve for x
    x = 59,013,520,985.09/275,868.36
  6. Step 6: Final answer
    x = 213,919.14

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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.