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Finding the Fourth Proportional to 72,898.20, 109,128.60 and 43,300.80

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Solution

The fourth proportional to 72,898.20, 109,128.60 and 43,300.80 is: 64,821.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,898.20 : 109,128.60 = 43,300.80 : x
  2. Step 2: Convert to fraction form
    72,898.20/109,128.60 = 43,300.80/x
  3. Step 3: Cross multiply
    72,898.20x = 109,128.60 × 43,300.80
  4. Step 4: Simplify right side
    72,898.20x = 4,725,355,682.88
  5. Step 5: Solve for x
    x = 4,725,355,682.88/72,898.20
  6. Step 6: Final answer
    x = 64,821.29

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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.