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Finding the Fourth Proportional to 8,971.38, 12,379.95 and 4,992.39

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Solution

The fourth proportional to 8,971.38, 12,379.95 and 4,992.39 is: 6,889.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,971.38 : 12,379.95 = 4,992.39 : x
  2. Step 2: Convert to fraction form
    8,971.38/12,379.95 = 4,992.39/x
  3. Step 3: Cross multiply
    8,971.38x = 12,379.95 × 4,992.39
  4. Step 4: Simplify right side
    8,971.38x = 61,805,538.58
  5. Step 5: Solve for x
    x = 61,805,538.58/8,971.38
  6. Step 6: Final answer
    x = 6,889.19

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1.5x scale

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.