Home / 20,904.48-28,824.96-20,420.64

Finding the Fourth Proportional to 20,904.48, 28,824.96 and 20,420.64

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Solution

The fourth proportional to 20,904.48, 28,824.96 and 20,420.64 is: 28,157.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,904.48 : 28,824.96 = 20,420.64 : x
  2. Step 2: Convert to fraction form
    20,904.48/28,824.96 = 20,420.64/x
  3. Step 3: Cross multiply
    20,904.48x = 28,824.96 × 20,420.64
  4. Step 4: Simplify right side
    20,904.48x = 588,624,131.17
  5. Step 5: Solve for x
    x = 588,624,131.17/20,904.48
  6. Step 6: Final answer
    x = 28,157.80

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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.