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Finding the Fourth Proportional to 2,012.68, 3,019.80 and 780.20

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Solution

The fourth proportional to 2,012.68, 3,019.80 and 780.20 is: 1,170.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,012.68 : 3,019.80 = 780.20 : x
  2. Step 2: Convert to fraction form
    2,012.68/3,019.80 = 780.20/x
  3. Step 3: Cross multiply
    2,012.68x = 3,019.80 × 780.20
  4. Step 4: Simplify right side
    2,012.68x = 2,356,047.96
  5. Step 5: Solve for x
    x = 2,356,047.96/2,012.68
  6. Step 6: Final answer
    x = 1,170.60

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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.