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Finding the Fourth Proportional to 3,855.61, 5,784.63 and 1,257.94

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Solution

The fourth proportional to 3,855.61, 5,784.63 and 1,257.94 is: 1,887.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,855.61 : 5,784.63 = 1,257.94 : x
  2. Step 2: Convert to fraction form
    3,855.61/5,784.63 = 1,257.94/x
  3. Step 3: Cross multiply
    3,855.61x = 5,784.63 × 1,257.94
  4. Step 4: Simplify right side
    3,855.61x = 7,276,717.46
  5. Step 5: Solve for x
    x = 7,276,717.46/3,855.61
  6. Step 6: Final answer
    x = 1,887.31

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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.