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Finding the Fourth Proportional to 1,143.74, 1,578.36 and 619.77

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Solution

The fourth proportional to 1,143.74, 1,578.36 and 619.77 is: 855.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,143.74 : 1,578.36 = 619.77 : x
  2. Step 2: Convert to fraction form
    1,143.74/1,578.36 = 619.77/x
  3. Step 3: Cross multiply
    1,143.74x = 1,578.36 × 619.77
  4. Step 4: Simplify right side
    1,143.74x = 978,220.18
  5. Step 5: Solve for x
    x = 978,220.18/1,143.74
  6. Step 6: Final answer
    x = 855.29

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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.