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Finding the Fourth Proportional to 72,664.35, 100,275.90 and 40,838.64

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Solution

The fourth proportional to 72,664.35, 100,275.90 and 40,838.64 is: 56,356.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,664.35 : 100,275.90 = 40,838.64 : x
  2. Step 2: Convert to fraction form
    72,664.35/100,275.90 = 40,838.64/x
  3. Step 3: Cross multiply
    72,664.35x = 100,275.90 × 40,838.64
  4. Step 4: Simplify right side
    72,664.35x = 4,095,131,380.78
  5. Step 5: Solve for x
    x = 4,095,131,380.78/72,664.35
  6. Step 6: Final answer
    x = 56,356.82

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.