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Finding the Fourth Proportional to 8,978.09, 12,389.55 and 4,999.11

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Solution

The fourth proportional to 8,978.09, 12,389.55 and 4,999.11 is: 6,898.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,978.09 : 12,389.55 = 4,999.11 : x
  2. Step 2: Convert to fraction form
    8,978.09/12,389.55 = 4,999.11/x
  3. Step 3: Cross multiply
    8,978.09x = 12,389.55 × 4,999.11
  4. Step 4: Simplify right side
    8,978.09x = 61,936,723.30
  5. Step 5: Solve for x
    x = 61,936,723.30/8,978.09
  6. Step 6: Final answer
    x = 6,898.66

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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.