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Finding the Fourth Proportional to 45,407.88, 68,127.12 and 20,103.90

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Solution

The fourth proportional to 45,407.88, 68,127.12 and 20,103.90 is: 30,162.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    45,407.88 : 68,127.12 = 20,103.90 : x
  2. Step 2: Convert to fraction form
    45,407.88/68,127.12 = 20,103.90/x
  3. Step 3: Cross multiply
    45,407.88x = 68,127.12 × 20,103.90
  4. Step 4: Simplify right side
    45,407.88x = 1,369,620,807.77
  5. Step 5: Solve for x
    x = 1,369,620,807.77/45,407.88
  6. Step 6: Final answer
    x = 30,162.62

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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.