Home / 12,140.81-18,218.29-5,120.39

Finding the Fourth Proportional to 12,140.81, 18,218.29 and 5,120.39

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Solution

The fourth proportional to 12,140.81, 18,218.29 and 5,120.39 is: 7,683.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,140.81 : 18,218.29 = 5,120.39 : x
  2. Step 2: Convert to fraction form
    12,140.81/18,218.29 = 5,120.39/x
  3. Step 3: Cross multiply
    12,140.81x = 18,218.29 × 5,120.39
  4. Step 4: Simplify right side
    12,140.81x = 93,284,749.93
  5. Step 5: Solve for x
    x = 93,284,749.93/12,140.81
  6. Step 6: Final answer
    x = 7,683.57

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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.