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Finding the Fourth Proportional to 20,412.91, 30,631.18 and 8,565.63

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Solution

The fourth proportional to 20,412.91, 30,631.18 and 8,565.63 is: 12,853.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,412.91 : 30,631.18 = 8,565.63 : x
  2. Step 2: Convert to fraction form
    20,412.91/30,631.18 = 8,565.63/x
  3. Step 3: Cross multiply
    20,412.91x = 30,631.18 × 8,565.63
  4. Step 4: Simplify right side
    20,412.91x = 262,375,201.19
  5. Step 5: Solve for x
    x = 262,375,201.19/20,412.91
  6. Step 6: Final answer
    x = 12,853.40

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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.