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Finding the Fourth Proportional to 2,977.05, 4,465.79 and 785.75

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Solution

The fourth proportional to 2,977.05, 4,465.79 and 785.75 is: 1,178.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,977.05 : 4,465.79 = 785.75 : x
  2. Step 2: Convert to fraction form
    2,977.05/4,465.79 = 785.75/x
  3. Step 3: Cross multiply
    2,977.05x = 4,465.79 × 785.75
  4. Step 4: Simplify right side
    2,977.05x = 3,508,990.56
  5. Step 5: Solve for x
    x = 3,508,990.56/2,977.05
  6. Step 6: Final answer
    x = 1,178.68

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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.