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Finding the Fourth Proportional to 18,764.64, 28,211.76 and 18,272.16

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Solution

The fourth proportional to 18,764.64, 28,211.76 and 18,272.16 is: 27,471.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,764.64 : 28,211.76 = 18,272.16 : x
  2. Step 2: Convert to fraction form
    18,764.64/28,211.76 = 18,272.16/x
  3. Step 3: Cross multiply
    18,764.64x = 28,211.76 × 18,272.16
  4. Step 4: Simplify right side
    18,764.64x = 515,489,792.60
  5. Step 5: Solve for x
    x = 515,489,792.60/18,764.64
  6. Step 6: Final answer
    x = 27,471.34

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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.