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Finding the Fourth Proportional to 72,638.42, 108,960.08 and 19,330.44

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Solution

The fourth proportional to 72,638.42, 108,960.08 and 19,330.44 is: 28,996.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,638.42 : 108,960.08 = 19,330.44 : x
  2. Step 2: Convert to fraction form
    72,638.42/108,960.08 = 19,330.44/x
  3. Step 3: Cross multiply
    72,638.42x = 108,960.08 × 19,330.44
  4. Step 4: Simplify right side
    72,638.42x = 2,106,246,811.67
  5. Step 5: Solve for x
    x = 2,106,246,811.67/72,638.42
  6. Step 6: Final answer
    x = 28,996.32

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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.