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Finding the Fourth Proportional to 2,415.10, 3,620.86 and 770.70

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Solution

The fourth proportional to 2,415.10, 3,620.86 and 770.70 is: 1,155.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,415.10 : 3,620.86 = 770.70 : x
  2. Step 2: Convert to fraction form
    2,415.10/3,620.86 = 770.70/x
  3. Step 3: Cross multiply
    2,415.10x = 3,620.86 × 770.70
  4. Step 4: Simplify right side
    2,415.10x = 2,790,596.80
  5. Step 5: Solve for x
    x = 2,790,596.80/2,415.10
  6. Step 6: Final answer
    x = 1,155.48

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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.