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Finding the Fourth Proportional to 79,602.39, 119,407.88 and 20,438.57

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Solution

The fourth proportional to 79,602.39, 119,407.88 and 20,438.57 is: 30,658.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,602.39 : 119,407.88 = 20,438.57 : x
  2. Step 2: Convert to fraction form
    79,602.39/119,407.88 = 20,438.57/x
  3. Step 3: Cross multiply
    79,602.39x = 119,407.88 × 20,438.57
  4. Step 4: Simplify right side
    79,602.39x = 2,440,526,663.55
  5. Step 5: Solve for x
    x = 2,440,526,663.55/79,602.39
  6. Step 6: Final answer
    x = 30,658.96

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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.