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Finding the Fourth Proportional to 275,717.90, 412,885.65 and 220,421.90

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Solution

The fourth proportional to 275,717.90, 412,885.65 and 220,421.90 is: 330,080.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    275,717.90 : 412,885.65 = 220,421.90 : x
  2. Step 2: Convert to fraction form
    275,717.90/412,885.65 = 220,421.90/x
  3. Step 3: Cross multiply
    275,717.90x = 412,885.65 × 220,421.90
  4. Step 4: Simplify right side
    275,717.90x = 91,009,039,455.74
  5. Step 5: Solve for x
    x = 91,009,039,455.74/275,717.90
  6. Step 6: Final answer
    x = 330,080.27

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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.