Home / 20,343.76-28,087.08-15,618.64

Finding the Fourth Proportional to 20,343.76, 28,087.08 and 15,618.64

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Solution

The fourth proportional to 20,343.76, 28,087.08 and 15,618.64 is: 21,563.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,343.76 : 28,087.08 = 15,618.64 : x
  2. Step 2: Convert to fraction form
    20,343.76/28,087.08 = 15,618.64/x
  3. Step 3: Cross multiply
    20,343.76x = 28,087.08 × 15,618.64
  4. Step 4: Simplify right side
    20,343.76x = 438,681,991.17
  5. Step 5: Solve for x
    x = 438,681,991.17/20,343.76
  6. Step 6: Final answer
    x = 21,563.47

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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.