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Finding the Fourth Proportional to 141,690.61, 212,498.99 and 66,790.87

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Solution

The fourth proportional to 141,690.61, 212,498.99 and 66,790.87 is: 100,168.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    141,690.61 : 212,498.99 = 66,790.87 : x
  2. Step 2: Convert to fraction form
    141,690.61/212,498.99 = 66,790.87/x
  3. Step 3: Cross multiply
    141,690.61x = 212,498.99 × 66,790.87
  4. Step 4: Simplify right side
    141,690.61x = 14,192,991,353.73
  5. Step 5: Solve for x
    x = 14,192,991,353.73/141,690.61
  6. Step 6: Final answer
    x = 100,168.90

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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.