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Finding the Fourth Proportional to 128,486.64, 192,769.40 and 57,469.04

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Solution

The fourth proportional to 128,486.64, 192,769.40 and 57,469.04 is: 86,221.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,486.64 : 192,769.40 = 57,469.04 : x
  2. Step 2: Convert to fraction form
    128,486.64/192,769.40 = 57,469.04/x
  3. Step 3: Cross multiply
    128,486.64x = 192,769.40 × 57,469.04
  4. Step 4: Simplify right side
    128,486.64x = 11,078,271,539.20
  5. Step 5: Solve for x
    x = 11,078,271,539.20/128,486.64
  6. Step 6: Final answer
    x = 86,221.19

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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.