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Finding the Fourth Proportional to 1,390.26, 1,918.54 and 769.26

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Solution

The fourth proportional to 1,390.26, 1,918.54 and 769.26 is: 1,061.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390.26 : 1,918.54 = 769.26 : x
  2. Step 2: Convert to fraction form
    1,390.26/1,918.54 = 769.26/x
  3. Step 3: Cross multiply
    1,390.26x = 1,918.54 × 769.26
  4. Step 4: Simplify right side
    1,390.26x = 1,475,856.08
  5. Step 5: Solve for x
    x = 1,475,856.08/1,390.26
  6. Step 6: Final answer
    x = 1,061.57

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.