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Finding the Fourth Proportional to 18,878.90, 28,334.55 and 8,365.10

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Solution

The fourth proportional to 18,878.90, 28,334.55 and 8,365.10 is: 12,554.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,878.90 : 28,334.55 = 8,365.10 : x
  2. Step 2: Convert to fraction form
    18,878.90/28,334.55 = 8,365.10/x
  3. Step 3: Cross multiply
    18,878.90x = 28,334.55 × 8,365.10
  4. Step 4: Simplify right side
    18,878.90x = 237,021,344.21
  5. Step 5: Solve for x
    x = 237,021,344.21/18,878.90
  6. Step 6: Final answer
    x = 12,554.83

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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.