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Finding the Fourth Proportional to 121,031.86, 166,955.80 and 72,621.27

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Solution

The fourth proportional to 121,031.86, 166,955.80 and 72,621.27 is: 100,176.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,031.86 : 166,955.80 = 72,621.27 : x
  2. Step 2: Convert to fraction form
    121,031.86/166,955.80 = 72,621.27/x
  3. Step 3: Cross multiply
    121,031.86x = 166,955.80 × 72,621.27
  4. Step 4: Simplify right side
    121,031.86x = 12,124,542,229.87
  5. Step 5: Solve for x
    x = 12,124,542,229.87/121,031.86
  6. Step 6: Final answer
    x = 100,176.45

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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.