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Finding the Fourth Proportional to 72,912.77, 109,378.28 and 28,533.79

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Solution

The fourth proportional to 72,912.77, 109,378.28 and 28,533.79 is: 42,804.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,912.77 : 109,378.28 = 28,533.79 : x
  2. Step 2: Convert to fraction form
    72,912.77/109,378.28 = 28,533.79/x
  3. Step 3: Cross multiply
    72,912.77x = 109,378.28 × 28,533.79
  4. Step 4: Simplify right side
    72,912.77x = 3,120,976,872.08
  5. Step 5: Solve for x
    x = 3,120,976,872.08/72,912.77
  6. Step 6: Final answer
    x = 42,804.26

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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.