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Finding the Fourth Proportional to 1,143.59, 1,578.11 and 619.61

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Solution

The fourth proportional to 1,143.59, 1,578.11 and 619.61 is: 855.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,143.59 : 1,578.11 = 619.61 : x
  2. Step 2: Convert to fraction form
    1,143.59/1,578.11 = 619.61/x
  3. Step 3: Cross multiply
    1,143.59x = 1,578.11 × 619.61
  4. Step 4: Simplify right side
    1,143.59x = 977,801.75
  5. Step 5: Solve for x
    x = 977,801.75/1,143.59
  6. Step 6: Final answer
    x = 855.03

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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.