Home / 20,388.48-28,137.24-15,343.64

Finding the Fourth Proportional to 20,388.48, 28,137.24 and 15,343.64

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Solution

The fourth proportional to 20,388.48, 28,137.24 and 15,343.64 is: 21,175.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,388.48 : 28,137.24 = 15,343.64 : x
  2. Step 2: Convert to fraction form
    20,388.48/28,137.24 = 15,343.64/x
  3. Step 3: Cross multiply
    20,388.48x = 28,137.24 × 15,343.64
  4. Step 4: Simplify right side
    20,388.48x = 431,727,681.15
  5. Step 5: Solve for x
    x = 431,727,681.15/20,388.48
  6. Step 6: Final answer
    x = 21,175.08

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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.