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Finding the Fourth Proportional to 210,620.88, 290,661 and 115,131.60

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Solution

The fourth proportional to 210,620.88, 290,661 and 115,131.60 is: 158,883.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,620.88 : 290,661 = 115,131.60 : x
  2. Step 2: Convert to fraction form
    210,620.88/290,661 = 115,131.60/x
  3. Step 3: Cross multiply
    210,620.88x = 290,661 × 115,131.60
  4. Step 4: Simplify right side
    210,620.88x = 33,464,265,987.60
  5. Step 5: Solve for x
    x = 33,464,265,987.60/210,620.88
  6. Step 6: Final answer
    x = 158,883.90

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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.