Home / 13,147.61-18,143.55-8,109.81

Finding the Fourth Proportional to 13,147.61, 18,143.55 and 8,109.81

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Solution

The fourth proportional to 13,147.61, 18,143.55 and 8,109.81 is: 11,191.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,147.61 : 18,143.55 = 8,109.81 : x
  2. Step 2: Convert to fraction form
    13,147.61/18,143.55 = 8,109.81/x
  3. Step 3: Cross multiply
    13,147.61x = 18,143.55 × 8,109.81
  4. Step 4: Simplify right side
    13,147.61x = 147,140,743.23
  5. Step 5: Solve for x
    x = 147,140,743.23/13,147.61
  6. Step 6: Final answer
    x = 11,191.45

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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.