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Finding the Fourth Proportional to 18,719.64, 28,071.70 and 7,618.79

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Solution

The fourth proportional to 18,719.64, 28,071.70 and 7,618.79 is: 11,425.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,719.64 : 28,071.70 = 7,618.79 : x
  2. Step 2: Convert to fraction form
    18,719.64/28,071.70 = 7,618.79/x
  3. Step 3: Cross multiply
    18,719.64x = 28,071.70 × 7,618.79
  4. Step 4: Simplify right side
    18,719.64x = 213,872,438.38
  5. Step 5: Solve for x
    x = 213,872,438.38/18,719.64
  6. Step 6: Final answer
    x = 11,425.03

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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.