Home / 8,689.42-11,991.61-4,912.81

Finding the Fourth Proportional to 8,689.42, 11,991.61 and 4,912.81

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Solution

The fourth proportional to 8,689.42, 11,991.61 and 4,912.81 is: 6,779.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,689.42 : 11,991.61 = 4,912.81 : x
  2. Step 2: Convert to fraction form
    8,689.42/11,991.61 = 4,912.81/x
  3. Step 3: Cross multiply
    8,689.42x = 11,991.61 × 4,912.81
  4. Step 4: Simplify right side
    8,689.42x = 58,912,501.52
  5. Step 5: Solve for x
    x = 58,912,501.52/8,689.42
  6. Step 6: Final answer
    x = 6,779.80

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1.5x scale

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.