Home / 20,918.50-28,867.56-11,487.70

Finding the Fourth Proportional to 20,918.50, 28,867.56 and 11,487.70

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Solution

The fourth proportional to 20,918.50, 28,867.56 and 11,487.70 is: 15,853.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,918.50 : 28,867.56 = 11,487.70 : x
  2. Step 2: Convert to fraction form
    20,918.50/28,867.56 = 11,487.70/x
  3. Step 3: Cross multiply
    20,918.50x = 28,867.56 × 11,487.70
  4. Step 4: Simplify right side
    20,918.50x = 331,621,869.01
  5. Step 5: Solve for x
    x = 331,621,869.01/20,918.50
  6. Step 6: Final answer
    x = 15,853.04

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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.