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Finding the Fourth Proportional to 72,693.10, 108,975.03 and 28,309.60

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Solution

The fourth proportional to 72,693.10, 108,975.03 and 28,309.60 is: 42,439.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,693.10 : 108,975.03 = 28,309.60 : x
  2. Step 2: Convert to fraction form
    72,693.10/108,975.03 = 28,309.60/x
  3. Step 3: Cross multiply
    72,693.10x = 108,975.03 × 28,309.60
  4. Step 4: Simplify right side
    72,693.10x = 3,085,039,509.29
  5. Step 5: Solve for x
    x = 3,085,039,509.29/72,693.10
  6. Step 6: Final answer
    x = 42,439.23

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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.