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Finding the Fourth Proportional to 18,709.60, 28,064.40 and 11,225.20

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Solution

The fourth proportional to 18,709.60, 28,064.40 and 11,225.20 is: 16,837.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,709.60 : 28,064.40 = 11,225.20 : x
  2. Step 2: Convert to fraction form
    18,709.60/28,064.40 = 11,225.20/x
  3. Step 3: Cross multiply
    18,709.60x = 28,064.40 × 11,225.20
  4. Step 4: Simplify right side
    18,709.60x = 315,028,502.88
  5. Step 5: Solve for x
    x = 315,028,502.88/18,709.60
  6. Step 6: Final answer
    x = 16,837.80

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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.