Home / 19,686.78-27,171.72-12,613.86

Finding the Fourth Proportional to 19,686.78, 27,171.72 and 12,613.86

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Solution

The fourth proportional to 19,686.78, 27,171.72 and 12,613.86 is: 17,409.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,686.78 : 27,171.72 = 12,613.86 : x
  2. Step 2: Convert to fraction form
    19,686.78/27,171.72 = 12,613.86/x
  3. Step 3: Cross multiply
    19,686.78x = 27,171.72 × 12,613.86
  4. Step 4: Simplify right side
    19,686.78x = 342,740,272.04
  5. Step 5: Solve for x
    x = 342,740,272.04/19,686.78
  6. Step 6: Final answer
    x = 17,409.67

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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.