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Finding the Fourth Proportional to 1,980.21, 2,970.30 and 519.34

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Solution

The fourth proportional to 1,980.21, 2,970.30 and 519.34 is: 779.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,980.21 : 2,970.30 = 519.34 : x
  2. Step 2: Convert to fraction form
    1,980.21/2,970.30 = 519.34/x
  3. Step 3: Cross multiply
    1,980.21x = 2,970.30 × 519.34
  4. Step 4: Simplify right side
    1,980.21x = 1,542,595.60
  5. Step 5: Solve for x
    x = 1,542,595.60/1,980.21
  6. Step 6: Final answer
    x = 779.01

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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.