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Finding the Fourth Proportional to 12,659.87, 18,975.32 and 7,918.18

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Solution

The fourth proportional to 12,659.87, 18,975.32 and 7,918.18 is: 11,868.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,659.87 : 18,975.32 = 7,918.18 : x
  2. Step 2: Convert to fraction form
    12,659.87/18,975.32 = 7,918.18/x
  3. Step 3: Cross multiply
    12,659.87x = 18,975.32 × 7,918.18
  4. Step 4: Simplify right side
    12,659.87x = 150,249,941.98
  5. Step 5: Solve for x
    x = 150,249,941.98/12,659.87
  6. Step 6: Final answer
    x = 11,868.21

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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.