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Finding the Fourth Proportional to 18,882.40, 28,291.20 and 12,305.20

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Solution

The fourth proportional to 18,882.40, 28,291.20 and 12,305.20 is: 18,436.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,882.40 : 28,291.20 = 12,305.20 : x
  2. Step 2: Convert to fraction form
    18,882.40/28,291.20 = 12,305.20/x
  3. Step 3: Cross multiply
    18,882.40x = 28,291.20 × 12,305.20
  4. Step 4: Simplify right side
    18,882.40x = 348,128,874.24
  5. Step 5: Solve for x
    x = 348,128,874.24/18,882.40
  6. Step 6: Final answer
    x = 18,436.69

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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.