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Finding the Fourth Proportional to 1,420.39, 2,128.15 and 769.96

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Solution

The fourth proportional to 1,420.39, 2,128.15 and 769.96 is: 1,153.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,420.39 : 2,128.15 = 769.96 : x
  2. Step 2: Convert to fraction form
    1,420.39/2,128.15 = 769.96/x
  3. Step 3: Cross multiply
    1,420.39x = 2,128.15 × 769.96
  4. Step 4: Simplify right side
    1,420.39x = 1,638,590.37
  5. Step 5: Solve for x
    x = 1,638,590.37/1,420.39
  6. Step 6: Final answer
    x = 1,153.62

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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.