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Finding the Fourth Proportional to 18,888.03, 28,335.40 and 7,788.65

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Solution

The fourth proportional to 18,888.03, 28,335.40 and 7,788.65 is: 11,684.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,888.03 : 28,335.40 = 7,788.65 : x
  2. Step 2: Convert to fraction form
    18,888.03/28,335.40 = 7,788.65/x
  3. Step 3: Cross multiply
    18,888.03x = 28,335.40 × 7,788.65
  4. Step 4: Simplify right side
    18,888.03x = 220,694,352.06
  5. Step 5: Solve for x
    x = 220,694,352.06/18,888.03
  6. Step 6: Final answer
    x = 11,684.35

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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.