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Finding the Fourth Proportional to 259,618.70, 389,602.20 and 91,138.70

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Solution

The fourth proportional to 259,618.70, 389,602.20 and 91,138.70 is: 136,769.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,618.70 : 389,602.20 = 91,138.70 : x
  2. Step 2: Convert to fraction form
    259,618.70/389,602.20 = 91,138.70/x
  3. Step 3: Cross multiply
    259,618.70x = 389,602.20 × 91,138.70
  4. Step 4: Simplify right side
    259,618.70x = 35,507,838,025.14
  5. Step 5: Solve for x
    x = 35,507,838,025.14/259,618.70
  6. Step 6: Final answer
    x = 136,769.19

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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.