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Finding the Fourth Proportional to 18,719.40, 28,054.82 and 7,613.16

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Solution

The fourth proportional to 18,719.40, 28,054.82 and 7,613.16 is: 11,409.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,719.40 : 28,054.82 = 7,613.16 : x
  2. Step 2: Convert to fraction form
    18,719.40/28,054.82 = 7,613.16/x
  3. Step 3: Cross multiply
    18,719.40x = 28,054.82 × 7,613.16
  4. Step 4: Simplify right side
    18,719.40x = 213,585,833.43
  5. Step 5: Solve for x
    x = 213,585,833.43/18,719.40
  6. Step 6: Final answer
    x = 11,409.87

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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.