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Finding the Fourth Proportional to 50,990, 70,369.80 and 28,634

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Solution

The fourth proportional to 50,990, 70,369.80 and 28,634 is: 39,516.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    50,990 : 70,369.80 = 28,634 : x
  2. Step 2: Convert to fraction form
    50,990/70,369.80 = 28,634/x
  3. Step 3: Cross multiply
    50,990x = 70,369.80 × 28,634
  4. Step 4: Simplify right side
    50,990x = 2,014,968,853.20
  5. Step 5: Solve for x
    x = 2,014,968,853.20/50,990
  6. Step 6: Final answer
    x = 39,516.94

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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.