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Finding the Fourth Proportional to 1,286.83, 1,928.62 and 977.75

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Solution

The fourth proportional to 1,286.83, 1,928.62 and 977.75 is: 1,465.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,286.83 : 1,928.62 = 977.75 : x
  2. Step 2: Convert to fraction form
    1,286.83/1,928.62 = 977.75/x
  3. Step 3: Cross multiply
    1,286.83x = 1,928.62 × 977.75
  4. Step 4: Simplify right side
    1,286.83x = 1,885,708.21
  5. Step 5: Solve for x
    x = 1,885,708.21/1,286.83
  6. Step 6: Final answer
    x = 1,465.39

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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.