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Finding the Fourth Proportional to 70,519.85, 105,779.79 and 17,211.72

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Solution

The fourth proportional to 70,519.85, 105,779.79 and 17,211.72 is: 25,817.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,519.85 : 105,779.79 = 17,211.72 : x
  2. Step 2: Convert to fraction form
    70,519.85/105,779.79 = 17,211.72/x
  3. Step 3: Cross multiply
    70,519.85x = 105,779.79 × 17,211.72
  4. Step 4: Simplify right side
    70,519.85x = 1,820,652,523.81
  5. Step 5: Solve for x
    x = 1,820,652,523.81/70,519.85
  6. Step 6: Final answer
    x = 25,817.59

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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.