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Finding the Fourth Proportional to 212,866.80, 318,911.40 and 173,209.20

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Solution

The fourth proportional to 212,866.80, 318,911.40 and 173,209.20 is: 259,497.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,866.80 : 318,911.40 = 173,209.20 : x
  2. Step 2: Convert to fraction form
    212,866.80/318,911.40 = 173,209.20/x
  3. Step 3: Cross multiply
    212,866.80x = 318,911.40 × 173,209.20
  4. Step 4: Simplify right side
    212,866.80x = 55,238,388,464.88
  5. Step 5: Solve for x
    x = 55,238,388,464.88/212,866.80
  6. Step 6: Final answer
    x = 259,497.43

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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.