Home / 20,428.08-28,189.80-11,353.02

Finding the Fourth Proportional to 20,428.08, 28,189.80 and 11,353.02

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Solution

The fourth proportional to 20,428.08, 28,189.80 and 11,353.02 is: 15,666.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,428.08 : 28,189.80 = 11,353.02 : x
  2. Step 2: Convert to fraction form
    20,428.08/28,189.80 = 11,353.02/x
  3. Step 3: Cross multiply
    20,428.08x = 28,189.80 × 11,353.02
  4. Step 4: Simplify right side
    20,428.08x = 320,039,363.20
  5. Step 5: Solve for x
    x = 320,039,363.20/20,428.08
  6. Step 6: Final answer
    x = 15,666.64

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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.