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Finding the Fourth Proportional to 81,391.10, 122,123.10 and 28,838.30

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Solution

The fourth proportional to 81,391.10, 122,123.10 and 28,838.30 is: 43,270.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,391.10 : 122,123.10 = 28,838.30 : x
  2. Step 2: Convert to fraction form
    81,391.10/122,123.10 = 28,838.30/x
  3. Step 3: Cross multiply
    81,391.10x = 122,123.10 × 28,838.30
  4. Step 4: Simplify right side
    81,391.10x = 3,521,822,594.73
  5. Step 5: Solve for x
    x = 3,521,822,594.73/81,391.10
  6. Step 6: Final answer
    x = 43,270.36

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1.5x scale

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.