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Finding the Fourth Proportional to 113,956.80, 171,089.10 and 66,620.40

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Solution

The fourth proportional to 113,956.80, 171,089.10 and 66,620.40 is: 100,020.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    113,956.80 : 171,089.10 = 66,620.40 : x
  2. Step 2: Convert to fraction form
    113,956.80/171,089.10 = 66,620.40/x
  3. Step 3: Cross multiply
    113,956.80x = 171,089.10 × 66,620.40
  4. Step 4: Simplify right side
    113,956.80x = 11,398,024,277.64
  5. Step 5: Solve for x
    x = 11,398,024,277.64/113,956.80
  6. Step 6: Final answer
    x = 100,020.57

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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.