Home / 20,690.96-28,549.19-13,531.37

Finding the Fourth Proportional to 20,690.96, 28,549.19 and 13,531.37

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Solution

The fourth proportional to 20,690.96, 28,549.19 and 13,531.37 is: 18,670.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,690.96 : 28,549.19 = 13,531.37 : x
  2. Step 2: Convert to fraction form
    20,690.96/28,549.19 = 13,531.37/x
  3. Step 3: Cross multiply
    20,690.96x = 28,549.19 × 13,531.37
  4. Step 4: Simplify right side
    20,690.96x = 386,309,615.55
  5. Step 5: Solve for x
    x = 386,309,615.55/20,690.96
  6. Step 6: Final answer
    x = 18,670.46

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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.