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Finding the Fourth Proportional to 8,971.68, 12,380.40 and 4,992.96

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Solution

The fourth proportional to 8,971.68, 12,380.40 and 4,992.96 is: 6,890.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,971.68 : 12,380.40 = 4,992.96 : x
  2. Step 2: Convert to fraction form
    8,971.68/12,380.40 = 4,992.96/x
  3. Step 3: Cross multiply
    8,971.68x = 12,380.40 × 4,992.96
  4. Step 4: Simplify right side
    8,971.68x = 61,814,841.98
  5. Step 5: Solve for x
    x = 61,814,841.98/8,971.68
  6. Step 6: Final answer
    x = 6,890.00

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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.