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Finding the Fourth Proportional to 72,407.76, 108,611.42 and 18,372.34

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Solution

The fourth proportional to 72,407.76, 108,611.42 and 18,372.34 is: 27,558.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,407.76 : 108,611.42 = 18,372.34 : x
  2. Step 2: Convert to fraction form
    72,407.76/108,611.42 = 18,372.34/x
  3. Step 3: Cross multiply
    72,407.76x = 108,611.42 × 18,372.34
  4. Step 4: Simplify right side
    72,407.76x = 1,995,445,514.73
  5. Step 5: Solve for x
    x = 1,995,445,514.73/72,407.76
  6. Step 6: Final answer
    x = 27,558.45

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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.