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Finding the Fourth Proportional to 3,421.80, 5,129.58 and 1,230

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Solution

The fourth proportional to 3,421.80, 5,129.58 and 1,230 is: 1,843.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,421.80 : 5,129.58 = 1,230 : x
  2. Step 2: Convert to fraction form
    3,421.80/5,129.58 = 1,230/x
  3. Step 3: Cross multiply
    3,421.80x = 5,129.58 × 1,230
  4. Step 4: Simplify right side
    3,421.80x = 6,309,383.40
  5. Step 5: Solve for x
    x = 6,309,383.40/3,421.80
  6. Step 6: Final answer
    x = 1,843.88

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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.