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Finding the Fourth Proportional to 259,492.51, 389,236.42 and 81,999.55

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Solution

The fourth proportional to 259,492.51, 389,236.42 and 81,999.55 is: 122,998.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,492.51 : 389,236.42 = 81,999.55 : x
  2. Step 2: Convert to fraction form
    259,492.51/389,236.42 = 81,999.55/x
  3. Step 3: Cross multiply
    259,492.51x = 389,236.42 × 81,999.55
  4. Step 4: Simplify right side
    259,492.51x = 31,917,211,283.61
  5. Step 5: Solve for x
    x = 31,917,211,283.61/259,492.51
  6. Step 6: Final answer
    x = 122,998.58

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1.5x scale

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.