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Finding the Fourth Proportional to 1,143.48, 1,578.01 and 619.51

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Solution

The fourth proportional to 1,143.48, 1,578.01 and 619.51 is: 854.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,143.48 : 1,578.01 = 619.51 : x
  2. Step 2: Convert to fraction form
    1,143.48/1,578.01 = 619.51/x
  3. Step 3: Cross multiply
    1,143.48x = 1,578.01 × 619.51
  4. Step 4: Simplify right side
    1,143.48x = 977,589.88
  5. Step 5: Solve for x
    x = 977,589.88/1,143.48
  6. Step 6: Final answer
    x = 854.93

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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.