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Finding the Fourth Proportional to 18,990.91, 28,488.64 and 7,905.09

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Solution

The fourth proportional to 18,990.91, 28,488.64 and 7,905.09 is: 11,858.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,990.91 : 28,488.64 = 7,905.09 : x
  2. Step 2: Convert to fraction form
    18,990.91/28,488.64 = 7,905.09/x
  3. Step 3: Cross multiply
    18,990.91x = 28,488.64 × 7,905.09
  4. Step 4: Simplify right side
    18,990.91x = 225,205,263.18
  5. Step 5: Solve for x
    x = 225,205,263.18/18,990.91
  6. Step 6: Final answer
    x = 11,858.58

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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.