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Finding the Fourth Proportional to 8,689.54, 11,991.42 and 4,912.57

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Solution

The fourth proportional to 8,689.54, 11,991.42 and 4,912.57 is: 6,779.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,689.54 : 11,991.42 = 4,912.57 : x
  2. Step 2: Convert to fraction form
    8,689.54/11,991.42 = 4,912.57/x
  3. Step 3: Cross multiply
    8,689.54x = 11,991.42 × 4,912.57
  4. Step 4: Simplify right side
    8,689.54x = 58,908,690.15
  5. Step 5: Solve for x
    x = 58,908,690.15/8,689.54
  6. Step 6: Final answer
    x = 6,779.26

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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.