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Finding the Fourth Proportional to 18,697.70, 25,808.55 and 11,149.58

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Solution

The fourth proportional to 18,697.70, 25,808.55 and 11,149.58 is: 15,389.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,697.70 : 25,808.55 = 11,149.58 : x
  2. Step 2: Convert to fraction form
    18,697.70/25,808.55 = 11,149.58/x
  3. Step 3: Cross multiply
    18,697.70x = 25,808.55 × 11,149.58
  4. Step 4: Simplify right side
    18,697.70x = 287,754,492.91
  5. Step 5: Solve for x
    x = 287,754,492.91/18,697.70
  6. Step 6: Final answer
    x = 15,389.83

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.