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Finding the Fourth Proportional to 12,590.94, 17,379.16 and 8,399.18

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Solution

The fourth proportional to 12,590.94, 17,379.16 and 8,399.18 is: 11,593.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,590.94 : 17,379.16 = 8,399.18 : x
  2. Step 2: Convert to fraction form
    12,590.94/17,379.16 = 8,399.18/x
  3. Step 3: Cross multiply
    12,590.94x = 17,379.16 × 8,399.18
  4. Step 4: Simplify right side
    12,590.94x = 145,970,693.09
  5. Step 5: Solve for x
    x = 145,970,693.09/12,590.94
  6. Step 6: Final answer
    x = 11,593.31

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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.