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Finding the Fourth Proportional to 18,880.90, 28,326.95 and 7,788.25

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Solution

The fourth proportional to 18,880.90, 28,326.95 and 7,788.25 is: 11,684.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,880.90 : 28,326.95 = 7,788.25 : x
  2. Step 2: Convert to fraction form
    18,880.90/28,326.95 = 7,788.25/x
  3. Step 3: Cross multiply
    18,880.90x = 28,326.95 × 7,788.25
  4. Step 4: Simplify right side
    18,880.90x = 220,617,394.01
  5. Step 5: Solve for x
    x = 220,617,394.01/18,880.90
  6. Step 6: Final answer
    x = 11,684.69

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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.