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Finding the Fourth Proportional to 2,018.45, 3,026.91 and 785.70

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Solution

The fourth proportional to 2,018.45, 3,026.91 and 785.70 is: 1,178.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,018.45 : 3,026.91 = 785.70 : x
  2. Step 2: Convert to fraction form
    2,018.45/3,026.91 = 785.70/x
  3. Step 3: Cross multiply
    2,018.45x = 3,026.91 × 785.70
  4. Step 4: Simplify right side
    2,018.45x = 2,378,243.19
  5. Step 5: Solve for x
    x = 2,378,243.19/2,018.45
  6. Step 6: Final answer
    x = 1,178.25

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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.