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Finding the Fourth Proportional to 8,978.22, 12,390.42 and 4,999.68

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Solution

The fourth proportional to 8,978.22, 12,390.42 and 4,999.68 is: 6,899.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,978.22 : 12,390.42 = 4,999.68 : x
  2. Step 2: Convert to fraction form
    8,978.22/12,390.42 = 4,999.68/x
  3. Step 3: Cross multiply
    8,978.22x = 12,390.42 × 4,999.68
  4. Step 4: Simplify right side
    8,978.22x = 61,948,135.07
  5. Step 5: Solve for x
    x = 61,948,135.07/8,978.22
  6. Step 6: Final answer
    x = 6,899.82

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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.