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Finding the Fourth Proportional to 138,751.57, 208,128.57 and 33,570.64

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Solution

The fourth proportional to 138,751.57, 208,128.57 and 33,570.64 is: 50,356.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,751.57 : 208,128.57 = 33,570.64 : x
  2. Step 2: Convert to fraction form
    138,751.57/208,128.57 = 33,570.64/x
  3. Step 3: Cross multiply
    138,751.57x = 208,128.57 × 33,570.64
  4. Step 4: Simplify right side
    138,751.57x = 6,987,009,297.18
  5. Step 5: Solve for x
    x = 6,987,009,297.18/138,751.57
  6. Step 6: Final answer
    x = 50,356.25

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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.