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Finding the Fourth Proportional to 72,612.60, 108,957.60 and 28,240.80

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Solution

The fourth proportional to 72,612.60, 108,957.60 and 28,240.80 is: 42,376.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,612.60 : 108,957.60 = 28,240.80 : x
  2. Step 2: Convert to fraction form
    72,612.60/108,957.60 = 28,240.80/x
  3. Step 3: Cross multiply
    72,612.60x = 108,957.60 × 28,240.80
  4. Step 4: Simplify right side
    72,612.60x = 3,077,049,790.08
  5. Step 5: Solve for x
    x = 3,077,049,790.08/72,612.60
  6. Step 6: Final answer
    x = 42,376.25

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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.