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Finding the Fourth Proportional to 12,636.87, 18,918.63 and 7,355.79

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Solution

The fourth proportional to 12,636.87, 18,918.63 and 7,355.79 is: 11,012.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,636.87 : 18,918.63 = 7,355.79 : x
  2. Step 2: Convert to fraction form
    12,636.87/18,918.63 = 7,355.79/x
  3. Step 3: Cross multiply
    12,636.87x = 18,918.63 × 7,355.79
  4. Step 4: Simplify right side
    12,636.87x = 139,161,374.77
  5. Step 5: Solve for x
    x = 139,161,374.77/12,636.87
  6. Step 6: Final answer
    x = 11,012.33

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1.5x scale

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.