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Finding the Fourth Proportional to 259,616.19, 389,427.40 and 91,141.40

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Solution

The fourth proportional to 259,616.19, 389,427.40 and 91,141.40 is: 136,713.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,616.19 : 389,427.40 = 91,141.40 : x
  2. Step 2: Convert to fraction form
    259,616.19/389,427.40 = 91,141.40/x
  3. Step 3: Cross multiply
    259,616.19x = 389,427.40 × 91,141.40
  4. Step 4: Simplify right side
    259,616.19x = 35,492,959,009.18
  5. Step 5: Solve for x
    x = 35,492,959,009.18/259,616.19
  6. Step 6: Final answer
    x = 136,713.20

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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.