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Finding the Fourth Proportional to 1,980.43, 2,970.65 and 519.58

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Solution

The fourth proportional to 1,980.43, 2,970.65 and 519.58 is: 779.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,980.43 : 2,970.65 = 519.58 : x
  2. Step 2: Convert to fraction form
    1,980.43/2,970.65 = 519.58/x
  3. Step 3: Cross multiply
    1,980.43x = 2,970.65 × 519.58
  4. Step 4: Simplify right side
    1,980.43x = 1,543,490.33
  5. Step 5: Solve for x
    x = 1,543,490.33/1,980.43
  6. Step 6: Final answer
    x = 779.37

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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.