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Finding the Fourth Proportional to 18,989.57, 28,468.98 and 7,904.55

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Solution

The fourth proportional to 18,989.57, 28,468.98 and 7,904.55 is: 11,850.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,989.57 : 28,468.98 = 7,904.55 : x
  2. Step 2: Convert to fraction form
    18,989.57/28,468.98 = 7,904.55/x
  3. Step 3: Cross multiply
    18,989.57x = 28,468.98 × 7,904.55
  4. Step 4: Simplify right side
    18,989.57x = 225,034,475.86
  5. Step 5: Solve for x
    x = 225,034,475.86/18,989.57
  6. Step 6: Final answer
    x = 11,850.43

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1.5x scale

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.