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Finding the Fourth Proportional to 109,656.80, 164,485.20 and 83,412.80

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Solution

The fourth proportional to 109,656.80, 164,485.20 and 83,412.80 is: 125,119.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    109,656.80 : 164,485.20 = 83,412.80 : x
  2. Step 2: Convert to fraction form
    109,656.80/164,485.20 = 83,412.80/x
  3. Step 3: Cross multiply
    109,656.80x = 164,485.20 × 83,412.80
  4. Step 4: Simplify right side
    109,656.80x = 13,720,171,090.56
  5. Step 5: Solve for x
    x = 13,720,171,090.56/109,656.80
  6. Step 6: Final answer
    x = 125,119.20

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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.