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Finding the Fourth Proportional to 1,384.34, 2,077.44 and 518.66

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Solution

The fourth proportional to 1,384.34, 2,077.44 and 518.66 is: 778.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,384.34 : 2,077.44 = 518.66 : x
  2. Step 2: Convert to fraction form
    1,384.34/2,077.44 = 518.66/x
  3. Step 3: Cross multiply
    1,384.34x = 2,077.44 × 518.66
  4. Step 4: Simplify right side
    1,384.34x = 1,077,485.03
  5. Step 5: Solve for x
    x = 1,077,485.03/1,384.34
  6. Step 6: Final answer
    x = 778.34

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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.