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Finding the Fourth Proportional to 2,619.19, 3,928.96 and 770.16

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Solution

The fourth proportional to 2,619.19, 3,928.96 and 770.16 is: 1,155.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,619.19 : 3,928.96 = 770.16 : x
  2. Step 2: Convert to fraction form
    2,619.19/3,928.96 = 770.16/x
  3. Step 3: Cross multiply
    2,619.19x = 3,928.96 × 770.16
  4. Step 4: Simplify right side
    2,619.19x = 3,025,917.10
  5. Step 5: Solve for x
    x = 3,025,917.10/2,619.19
  6. Step 6: Final answer
    x = 1,155.29

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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.