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Finding the Fourth Proportional to 1,384.59, 2,075.49 and 518.70

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Solution

The fourth proportional to 1,384.59, 2,075.49 and 518.70 is: 777.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,384.59 : 2,075.49 = 518.70 : x
  2. Step 2: Convert to fraction form
    1,384.59/2,075.49 = 518.70/x
  3. Step 3: Cross multiply
    1,384.59x = 2,075.49 × 518.70
  4. Step 4: Simplify right side
    1,384.59x = 1,076,556.66
  5. Step 5: Solve for x
    x = 1,076,556.66/1,384.59
  6. Step 6: Final answer
    x = 777.53

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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.