Home / 20,867.81-28,780.80-18,344.57

Finding the Fourth Proportional to 20,867.81, 28,780.80 and 18,344.57

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Solution

The fourth proportional to 20,867.81, 28,780.80 and 18,344.57 is: 25,300.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,867.81 : 28,780.80 = 18,344.57 : x
  2. Step 2: Convert to fraction form
    20,867.81/28,780.80 = 18,344.57/x
  3. Step 3: Cross multiply
    20,867.81x = 28,780.80 × 18,344.57
  4. Step 4: Simplify right side
    20,867.81x = 527,971,256.35
  5. Step 5: Solve for x
    x = 527,971,256.35/20,867.81
  6. Step 6: Final answer
    x = 25,300.76

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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.