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Finding the Fourth Proportional to 18,991.80, 28,492.65 and 11,101.05

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Solution

The fourth proportional to 18,991.80, 28,492.65 and 11,101.05 is: 16,654.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,991.80 : 28,492.65 = 11,101.05 : x
  2. Step 2: Convert to fraction form
    18,991.80/28,492.65 = 11,101.05/x
  3. Step 3: Cross multiply
    18,991.80x = 28,492.65 × 11,101.05
  4. Step 4: Simplify right side
    18,991.80x = 316,298,134.31
  5. Step 5: Solve for x
    x = 316,298,134.31/18,991.80
  6. Step 6: Final answer
    x = 16,654.46

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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.