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Finding the Fourth Proportional to 1,289.55, 1,929.54 and 769.84

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Solution

The fourth proportional to 1,289.55, 1,929.54 and 769.84 is: 1,151.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,289.55 : 1,929.54 = 769.84 : x
  2. Step 2: Convert to fraction form
    1,289.55/1,929.54 = 769.84/x
  3. Step 3: Cross multiply
    1,289.55x = 1,929.54 × 769.84
  4. Step 4: Simplify right side
    1,289.55x = 1,485,437.07
  5. Step 5: Solve for x
    x = 1,485,437.07/1,289.55
  6. Step 6: Final answer
    x = 1,151.90

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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.