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Finding the Fourth Proportional to 1,252.33, 1,878.93 and 790.43

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Solution

The fourth proportional to 1,252.33, 1,878.93 and 790.43 is: 1,185.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,252.33 : 1,878.93 = 790.43 : x
  2. Step 2: Convert to fraction form
    1,252.33/1,878.93 = 790.43/x
  3. Step 3: Cross multiply
    1,252.33x = 1,878.93 × 790.43
  4. Step 4: Simplify right side
    1,252.33x = 1,485,153.25
  5. Step 5: Solve for x
    x = 1,485,153.25/1,252.33
  6. Step 6: Final answer
    x = 1,185.91

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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.