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Finding the Fourth Proportional to 1,286, 1,928.83 and 505.47

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Solution

The fourth proportional to 1,286, 1,928.83 and 505.47 is: 758.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,286 : 1,928.83 = 505.47 : x
  2. Step 2: Convert to fraction form
    1,286/1,928.83 = 505.47/x
  3. Step 3: Cross multiply
    1,286x = 1,928.83 × 505.47
  4. Step 4: Simplify right side
    1,286x = 974,965.70
  5. Step 5: Solve for x
    x = 974,965.70/1,286
  6. Step 6: Final answer
    x = 758.14

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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.