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Finding the Fourth Proportional to 15,100.80, 20,840.64 and 8,812.80

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Solution

The fourth proportional to 15,100.80, 20,840.64 and 8,812.80 is: 12,162.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,100.80 : 20,840.64 = 8,812.80 : x
  2. Step 2: Convert to fraction form
    15,100.80/20,840.64 = 8,812.80/x
  3. Step 3: Cross multiply
    15,100.80x = 20,840.64 × 8,812.80
  4. Step 4: Simplify right side
    15,100.80x = 183,664,392.19
  5. Step 5: Solve for x
    x = 183,664,392.19/15,100.80
  6. Step 6: Final answer
    x = 12,162.56

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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.