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Finding the Fourth Proportional to 1,419.67, 2,129.96 and 770.05

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Solution

The fourth proportional to 1,419.67, 2,129.96 and 770.05 is: 1,155.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,419.67 : 2,129.96 = 770.05 : x
  2. Step 2: Convert to fraction form
    1,419.67/2,129.96 = 770.05/x
  3. Step 3: Cross multiply
    1,419.67x = 2,129.96 × 770.05
  4. Step 4: Simplify right side
    1,419.67x = 1,640,175.70
  5. Step 5: Solve for x
    x = 1,640,175.70/1,419.67
  6. Step 6: Final answer
    x = 1,155.32

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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.