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Finding the Fourth Proportional to 18,958.13, 28,438.44 and 7,865.71

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Solution

The fourth proportional to 18,958.13, 28,438.44 and 7,865.71 is: 11,799.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,958.13 : 28,438.44 = 7,865.71 : x
  2. Step 2: Convert to fraction form
    18,958.13/28,438.44 = 7,865.71/x
  3. Step 3: Cross multiply
    18,958.13x = 28,438.44 × 7,865.71
  4. Step 4: Simplify right side
    18,958.13x = 223,688,465.54
  5. Step 5: Solve for x
    x = 223,688,465.54/18,958.13
  6. Step 6: Final answer
    x = 11,799.08

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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.