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Finding the Fourth Proportional to 7,690.72, 11,520.90 and 3,995.36

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Solution

The fourth proportional to 7,690.72, 11,520.90 and 3,995.36 is: 5,985.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,690.72 : 11,520.90 = 3,995.36 : x
  2. Step 2: Convert to fraction form
    7,690.72/11,520.90 = 3,995.36/x
  3. Step 3: Cross multiply
    7,690.72x = 11,520.90 × 3,995.36
  4. Step 4: Simplify right side
    7,690.72x = 46,030,143.02
  5. Step 5: Solve for x
    x = 46,030,143.02/7,690.72
  6. Step 6: Final answer
    x = 5,985.15

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1.5x scale

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.