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Finding the Fourth Proportional to 67,420.80, 100,973.52 and 53,285.96

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Solution

The fourth proportional to 67,420.80, 100,973.52 and 53,285.96 is: 79,804.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    67,420.80 : 100,973.52 = 53,285.96 : x
  2. Step 2: Convert to fraction form
    67,420.80/100,973.52 = 53,285.96/x
  3. Step 3: Cross multiply
    67,420.80x = 100,973.52 × 53,285.96
  4. Step 4: Simplify right side
    67,420.80x = 5,380,471,200.21
  5. Step 5: Solve for x
    x = 5,380,471,200.21/67,420.80
  6. Step 6: Final answer
    x = 79,804.32

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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.