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Finding the Fourth Proportional to 18,989.91, 28,487.14 and 7,904.09

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Solution

The fourth proportional to 18,989.91, 28,487.14 and 7,904.09 is: 11,857.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,989.91 : 28,487.14 = 7,904.09 : x
  2. Step 2: Convert to fraction form
    18,989.91/28,487.14 = 7,904.09/x
  3. Step 3: Cross multiply
    18,989.91x = 28,487.14 × 7,904.09
  4. Step 4: Simplify right side
    18,989.91x = 225,164,969.86
  5. Step 5: Solve for x
    x = 225,164,969.86/18,989.91
  6. Step 6: Final answer
    x = 11,857.08

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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.