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Finding the Fourth Proportional to 8,690.85, 11,995.34 and 4,916.21

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Solution

The fourth proportional to 8,690.85, 11,995.34 and 4,916.21 is: 6,785.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,690.85 : 11,995.34 = 4,916.21 : x
  2. Step 2: Convert to fraction form
    8,690.85/11,995.34 = 4,916.21/x
  3. Step 3: Cross multiply
    8,690.85x = 11,995.34 × 4,916.21
  4. Step 4: Simplify right side
    8,690.85x = 58,971,525.90
  5. Step 5: Solve for x
    x = 58,971,525.90/8,690.85
  6. Step 6: Final answer
    x = 6,785.47

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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.