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Finding the Fourth Proportional to 5,318.58, 7,978.16 and 1,620.93

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Solution

The fourth proportional to 5,318.58, 7,978.16 and 1,620.93 is: 2,431.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,318.58 : 7,978.16 = 1,620.93 : x
  2. Step 2: Convert to fraction form
    5,318.58/7,978.16 = 1,620.93/x
  3. Step 3: Cross multiply
    5,318.58x = 7,978.16 × 1,620.93
  4. Step 4: Simplify right side
    5,318.58x = 12,932,003.05
  5. Step 5: Solve for x
    x = 12,932,003.05/5,318.58
  6. Step 6: Final answer
    x = 2,431.48

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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.