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Finding the Fourth Proportional to 65,779.85, 90,817.70 and 45,629.69

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Solution

The fourth proportional to 65,779.85, 90,817.70 and 45,629.69 is: 62,997.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,779.85 : 90,817.70 = 45,629.69 : x
  2. Step 2: Convert to fraction form
    65,779.85/90,817.70 = 45,629.69/x
  3. Step 3: Cross multiply
    65,779.85x = 90,817.70 × 45,629.69
  4. Step 4: Simplify right side
    65,779.85x = 4,143,983,157.50
  5. Step 5: Solve for x
    x = 4,143,983,157.50/65,779.85
  6. Step 6: Final answer
    x = 62,997.76

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.