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Finding the Fourth Proportional to 99,480.54, 149,221.02 and 81,913.50

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Solution

The fourth proportional to 99,480.54, 149,221.02 and 81,913.50 is: 122,870.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,480.54 : 149,221.02 = 81,913.50 : x
  2. Step 2: Convert to fraction form
    99,480.54/149,221.02 = 81,913.50/x
  3. Step 3: Cross multiply
    99,480.54x = 149,221.02 × 81,913.50
  4. Step 4: Simplify right side
    99,480.54x = 12,223,216,021.77
  5. Step 5: Solve for x
    x = 12,223,216,021.77/99,480.54
  6. Step 6: Final answer
    x = 122,870.42

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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.