Home / 21,428.40-32,147.40-8,279.60

Finding the Fourth Proportional to 21,428.40, 32,147.40 and 8,279.60

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Solution

The fourth proportional to 21,428.40, 32,147.40 and 8,279.60 is: 12,421.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,428.40 : 32,147.40 = 8,279.60 : x
  2. Step 2: Convert to fraction form
    21,428.40/32,147.40 = 8,279.60/x
  3. Step 3: Cross multiply
    21,428.40x = 32,147.40 × 8,279.60
  4. Step 4: Simplify right side
    21,428.40x = 266,167,613.04
  5. Step 5: Solve for x
    x = 266,167,613.04/21,428.40
  6. Step 6: Final answer
    x = 12,421.25

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.