Home / 20,388.16-28,097.56-15,904.80

Finding the Fourth Proportional to 20,388.16, 28,097.56 and 15,904.80

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Solution

The fourth proportional to 20,388.16, 28,097.56 and 15,904.80 is: 21,918.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,388.16 : 28,097.56 = 15,904.80 : x
  2. Step 2: Convert to fraction form
    20,388.16/28,097.56 = 15,904.80/x
  3. Step 3: Cross multiply
    20,388.16x = 28,097.56 × 15,904.80
  4. Step 4: Simplify right side
    20,388.16x = 446,886,072.29
  5. Step 5: Solve for x
    x = 446,886,072.29/20,388.16
  6. Step 6: Final answer
    x = 21,918.90

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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.