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Finding the Fourth Proportional to 81,423.86, 122,690.45 and 66,956.85

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Solution

The fourth proportional to 81,423.86, 122,690.45 and 66,956.85 is: 100,891.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,423.86 : 122,690.45 = 66,956.85 : x
  2. Step 2: Convert to fraction form
    81,423.86/122,690.45 = 66,956.85/x
  3. Step 3: Cross multiply
    81,423.86x = 122,690.45 × 66,956.85
  4. Step 4: Simplify right side
    81,423.86x = 8,214,966,224.47
  5. Step 5: Solve for x
    x = 8,214,966,224.47/81,423.86
  6. Step 6: Final answer
    x = 100,891.39

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.