Home / 20,685.51-28,512.81-13,968.99

Finding the Fourth Proportional to 20,685.51, 28,512.81 and 13,968.99

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Solution

The fourth proportional to 20,685.51, 28,512.81 and 13,968.99 is: 19,254.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,685.51 : 28,512.81 = 13,968.99 : x
  2. Step 2: Convert to fraction form
    20,685.51/28,512.81 = 13,968.99/x
  3. Step 3: Cross multiply
    20,685.51x = 28,512.81 × 13,968.99
  4. Step 4: Simplify right side
    20,685.51x = 398,295,157.76
  5. Step 5: Solve for x
    x = 398,295,157.76/20,685.51
  6. Step 6: Final answer
    x = 19,254.79

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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.