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Finding the Fourth Proportional to 7,978.12, 11,010.20 and 4,441.25

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Solution

The fourth proportional to 7,978.12, 11,010.20 and 4,441.25 is: 6,129.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,978.12 : 11,010.20 = 4,441.25 : x
  2. Step 2: Convert to fraction form
    7,978.12/11,010.20 = 4,441.25/x
  3. Step 3: Cross multiply
    7,978.12x = 11,010.20 × 4,441.25
  4. Step 4: Simplify right side
    7,978.12x = 48,899,056.07
  5. Step 5: Solve for x
    x = 48,899,056.07/7,978.12
  6. Step 6: Final answer
    x = 6,129.15

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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.