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Finding the Fourth Proportional to 307,911.40, 461,771.10 and 120,980.20

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Solution

The fourth proportional to 307,911.40, 461,771.10 and 120,980.20 is: 181,432.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    307,911.40 : 461,771.10 = 120,980.20 : x
  2. Step 2: Convert to fraction form
    307,911.40/461,771.10 = 120,980.20/x
  3. Step 3: Cross multiply
    307,911.40x = 461,771.10 × 120,980.20
  4. Step 4: Simplify right side
    307,911.40x = 55,865,160,032.22
  5. Step 5: Solve for x
    x = 55,865,160,032.22/307,911.40
  6. Step 6: Final answer
    x = 181,432.58

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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.