Home / 21,861.60-30,167.28-12,428.16

Finding the Fourth Proportional to 21,861.60, 30,167.28 and 12,428.16

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Solution

The fourth proportional to 21,861.60, 30,167.28 and 12,428.16 is: 17,149.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,861.60 : 30,167.28 = 12,428.16 : x
  2. Step 2: Convert to fraction form
    21,861.60/30,167.28 = 12,428.16/x
  3. Step 3: Cross multiply
    21,861.60x = 30,167.28 × 12,428.16
  4. Step 4: Simplify right side
    21,861.60x = 374,923,782.60
  5. Step 5: Solve for x
    x = 374,923,782.60/21,861.60
  6. Step 6: Final answer
    x = 17,149.88

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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.