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Finding the Fourth Proportional to 7,489.15, 11,230.47 and 3,978.40

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Solution

The fourth proportional to 7,489.15, 11,230.47 and 3,978.40 is: 5,965.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,489.15 : 11,230.47 = 3,978.40 : x
  2. Step 2: Convert to fraction form
    7,489.15/11,230.47 = 3,978.40/x
  3. Step 3: Cross multiply
    7,489.15x = 11,230.47 × 3,978.40
  4. Step 4: Simplify right side
    7,489.15x = 44,679,301.85
  5. Step 5: Solve for x
    x = 44,679,301.85/7,489.15
  6. Step 6: Final answer
    x = 5,965.87

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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.