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Finding the Fourth Proportional to 275,485.51, 380,140.79 and 154,640.09

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Solution

The fourth proportional to 275,485.51, 380,140.79 and 154,640.09 is: 213,386.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    275,485.51 : 380,140.79 = 154,640.09 : x
  2. Step 2: Convert to fraction form
    275,485.51/380,140.79 = 154,640.09/x
  3. Step 3: Cross multiply
    275,485.51x = 380,140.79 × 154,640.09
  4. Step 4: Simplify right side
    275,485.51x = 58,785,005,978.27
  5. Step 5: Solve for x
    x = 58,785,005,978.27/275,485.51
  6. Step 6: Final answer
    x = 213,386.93

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1.5x scale

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.