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Finding the Fourth Proportional to 199,911.40, 299,721.30 and 81,521.80

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Solution

The fourth proportional to 199,911.40, 299,721.30 and 81,521.80 is: 122,223.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    199,911.40 : 299,721.30 = 81,521.80 : x
  2. Step 2: Convert to fraction form
    199,911.40/299,721.30 = 81,521.80/x
  3. Step 3: Cross multiply
    199,911.40x = 299,721.30 × 81,521.80
  4. Step 4: Simplify right side
    199,911.40x = 24,433,819,874.34
  5. Step 5: Solve for x
    x = 24,433,819,874.34/199,911.40
  6. Step 6: Final answer
    x = 122,223.24

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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.