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Finding the Fourth Proportional to 2,079.51, 3,119.39 and 780.95

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Solution

The fourth proportional to 2,079.51, 3,119.39 and 780.95 is: 1,171.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,079.51 : 3,119.39 = 780.95 : x
  2. Step 2: Convert to fraction form
    2,079.51/3,119.39 = 780.95/x
  3. Step 3: Cross multiply
    2,079.51x = 3,119.39 × 780.95
  4. Step 4: Simplify right side
    2,079.51x = 2,436,068.12
  5. Step 5: Solve for x
    x = 2,436,068.12/2,079.51
  6. Step 6: Final answer
    x = 1,171.46

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1.5x scale

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.