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Finding the Fourth Proportional to 18,958.77, 28,438.17 and 5,107.77

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Solution

The fourth proportional to 18,958.77, 28,438.17 and 5,107.77 is: 7,661.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,958.77 : 28,438.17 = 5,107.77 : x
  2. Step 2: Convert to fraction form
    18,958.77/28,438.17 = 5,107.77/x
  3. Step 3: Cross multiply
    18,958.77x = 28,438.17 × 5,107.77
  4. Step 4: Simplify right side
    18,958.77x = 145,255,631.58
  5. Step 5: Solve for x
    x = 145,255,631.58/18,958.77
  6. Step 6: Final answer
    x = 7,661.66

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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.