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Finding the Fourth Proportional to 18,878.63, 28,291.08 and 13,909.19

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Solution

The fourth proportional to 18,878.63, 28,291.08 and 13,909.19 is: 20,843.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,878.63 : 28,291.08 = 13,909.19 : x
  2. Step 2: Convert to fraction form
    18,878.63/28,291.08 = 13,909.19/x
  3. Step 3: Cross multiply
    18,878.63x = 28,291.08 × 13,909.19
  4. Step 4: Simplify right side
    18,878.63x = 393,506,007.03
  5. Step 5: Solve for x
    x = 393,506,007.03/18,878.63
  6. Step 6: Final answer
    x = 20,843.99

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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.