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Finding the Fourth Proportional to 17,705.60, 26,561.60 and 8,918.40

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Solution

The fourth proportional to 17,705.60, 26,561.60 and 8,918.40 is: 13,379.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    17,705.60 : 26,561.60 = 8,918.40 : x
  2. Step 2: Convert to fraction form
    17,705.60/26,561.60 = 8,918.40/x
  3. Step 3: Cross multiply
    17,705.60x = 26,561.60 × 8,918.40
  4. Step 4: Simplify right side
    17,705.60x = 236,886,973.44
  5. Step 5: Solve for x
    x = 236,886,973.44/17,705.60
  6. Step 6: Final answer
    x = 13,379.21

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.