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Finding the Fourth Proportional to 1,252.51, 1,878.78 and 386.83

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Solution

The fourth proportional to 1,252.51, 1,878.78 and 386.83 is: 580.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,252.51 : 1,878.78 = 386.83 : x
  2. Step 2: Convert to fraction form
    1,252.51/1,878.78 = 386.83/x
  3. Step 3: Cross multiply
    1,252.51x = 1,878.78 × 386.83
  4. Step 4: Simplify right side
    1,252.51x = 726,768.47
  5. Step 5: Solve for x
    x = 726,768.47/1,252.51
  6. Step 6: Final answer
    x = 580.25

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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.