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Finding the Fourth Proportional to 28,690.70, 43,038.70 and 11,161.86

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Solution

The fourth proportional to 28,690.70, 43,038.70 and 11,161.86 is: 16,743.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,690.70 : 43,038.70 = 11,161.86 : x
  2. Step 2: Convert to fraction form
    28,690.70/43,038.70 = 11,161.86/x
  3. Step 3: Cross multiply
    28,690.70x = 43,038.70 × 11,161.86
  4. Step 4: Simplify right side
    28,690.70x = 480,391,943.98
  5. Step 5: Solve for x
    x = 480,391,943.98/28,690.70
  6. Step 6: Final answer
    x = 16,743.82

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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.