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Finding the Fourth Proportional to 15,388.80, 21,379.20 and 15,244.80

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Solution

The fourth proportional to 15,388.80, 21,379.20 and 15,244.80 is: 21,179.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,388.80 : 21,379.20 = 15,244.80 : x
  2. Step 2: Convert to fraction form
    15,388.80/21,379.20 = 15,244.80/x
  3. Step 3: Cross multiply
    15,388.80x = 21,379.20 × 15,244.80
  4. Step 4: Simplify right side
    15,388.80x = 325,921,628.16
  5. Step 5: Solve for x
    x = 325,921,628.16/15,388.80
  6. Step 6: Final answer
    x = 21,179.15

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.