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Finding the Fourth Proportional to 2,345.45, 3,518.31 and 785.66

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Solution

The fourth proportional to 2,345.45, 3,518.31 and 785.66 is: 1,178.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,345.45 : 3,518.31 = 785.66 : x
  2. Step 2: Convert to fraction form
    2,345.45/3,518.31 = 785.66/x
  3. Step 3: Cross multiply
    2,345.45x = 3,518.31 × 785.66
  4. Step 4: Simplify right side
    2,345.45x = 2,764,195.43
  5. Step 5: Solve for x
    x = 2,764,195.43/2,345.45
  6. Step 6: Final answer
    x = 1,178.54

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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.