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Finding the Fourth Proportional to 30,990.80, 42,766.99 and 16,843.55

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Solution

The fourth proportional to 30,990.80, 42,766.99 and 16,843.55 is: 23,243.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,990.80 : 42,766.99 = 16,843.55 : x
  2. Step 2: Convert to fraction form
    30,990.80/42,766.99 = 16,843.55/x
  3. Step 3: Cross multiply
    30,990.80x = 42,766.99 × 16,843.55
  4. Step 4: Simplify right side
    30,990.80x = 720,347,678.47
  5. Step 5: Solve for x
    x = 720,347,678.47/30,990.80
  6. Step 6: Final answer
    x = 23,243.92

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1.5x scale

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.