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Finding the Fourth Proportional to 189,368.85, 261,218.82 and 121,361.67

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Solution

The fourth proportional to 189,368.85, 261,218.82 and 121,361.67 is: 167,408.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    189,368.85 : 261,218.82 = 121,361.67 : x
  2. Step 2: Convert to fraction form
    189,368.85/261,218.82 = 121,361.67/x
  3. Step 3: Cross multiply
    189,368.85x = 261,218.82 × 121,361.67
  4. Step 4: Simplify right side
    189,368.85x = 31,701,952,230.63
  5. Step 5: Solve for x
    x = 31,701,952,230.63/189,368.85
  6. Step 6: Final answer
    x = 167,408.48

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.