Home / 20,421.68-28,180.85-13,706.37

Finding the Fourth Proportional to 20,421.68, 28,180.85 and 13,706.37

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Solution

The fourth proportional to 20,421.68, 28,180.85 and 13,706.37 is: 18,914.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,421.68 : 28,180.85 = 13,706.37 : x
  2. Step 2: Convert to fraction form
    20,421.68/28,180.85 = 13,706.37/x
  3. Step 3: Cross multiply
    20,421.68x = 28,180.85 × 13,706.37
  4. Step 4: Simplify right side
    20,421.68x = 386,257,088.48
  5. Step 5: Solve for x
    x = 386,257,088.48/20,421.68
  6. Step 6: Final answer
    x = 18,914.07

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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.