Home / 20,412.72-28,187.28-12,872.52

Finding the Fourth Proportional to 20,412.72, 28,187.28 and 12,872.52

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Solution

The fourth proportional to 20,412.72, 28,187.28 and 12,872.52 is: 17,775.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,412.72 : 28,187.28 = 12,872.52 : x
  2. Step 2: Convert to fraction form
    20,412.72/28,187.28 = 12,872.52/x
  3. Step 3: Cross multiply
    20,412.72x = 28,187.28 × 12,872.52
  4. Step 4: Simplify right side
    20,412.72x = 362,841,325.55
  5. Step 5: Solve for x
    x = 362,841,325.55/20,412.72
  6. Step 6: Final answer
    x = 17,775.26

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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.