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Finding the Fourth Proportional to 8,919.16, 12,311.08 and 5,775.56

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Solution

The fourth proportional to 8,919.16, 12,311.08 and 5,775.56 is: 7,971.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,919.16 : 12,311.08 = 5,775.56 : x
  2. Step 2: Convert to fraction form
    8,919.16/12,311.08 = 5,775.56/x
  3. Step 3: Cross multiply
    8,919.16x = 12,311.08 × 5,775.56
  4. Step 4: Simplify right side
    8,919.16x = 71,103,381.20
  5. Step 5: Solve for x
    x = 71,103,381.20/8,919.16
  6. Step 6: Final answer
    x = 7,971.98

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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.