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Finding the Fourth Proportional to 2,619.28, 3,929.08 and 770.23

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Solution

The fourth proportional to 2,619.28, 3,929.08 and 770.23 is: 1,155.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,619.28 : 3,929.08 = 770.23 : x
  2. Step 2: Convert to fraction form
    2,619.28/3,929.08 = 770.23/x
  3. Step 3: Cross multiply
    2,619.28x = 3,929.08 × 770.23
  4. Step 4: Simplify right side
    2,619.28x = 3,026,295.29
  5. Step 5: Solve for x
    x = 3,026,295.29/2,619.28
  6. Step 6: Final answer
    x = 1,155.39

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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.