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Finding the Fourth Proportional to 259,385.21, 389,114.22 and 90,866.96

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Solution

The fourth proportional to 259,385.21, 389,114.22 and 90,866.96 is: 136,313.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,385.21 : 389,114.22 = 90,866.96 : x
  2. Step 2: Convert to fraction form
    259,385.21/389,114.22 = 90,866.96/x
  3. Step 3: Cross multiply
    259,385.21x = 389,114.22 × 90,866.96
  4. Step 4: Simplify right side
    259,385.21x = 35,357,624,318.60
  5. Step 5: Solve for x
    x = 35,357,624,318.60/259,385.21
  6. Step 6: Final answer
    x = 136,313.19

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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.