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Finding the Fourth Proportional to 18,991.10, 28,486.84 and 12,458.72

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Solution

The fourth proportional to 18,991.10, 28,486.84 and 12,458.72 is: 18,688.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,991.10 : 28,486.84 = 12,458.72 : x
  2. Step 2: Convert to fraction form
    18,991.10/28,486.84 = 12,458.72/x
  3. Step 3: Cross multiply
    18,991.10x = 28,486.84 × 12,458.72
  4. Step 4: Simplify right side
    18,991.10x = 354,909,563.24
  5. Step 5: Solve for x
    x = 354,909,563.24/18,991.10
  6. Step 6: Final answer
    x = 18,688.20

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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.