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Finding the Fourth Proportional to 8,445.40, 12,668.10 and 6,890.20

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Solution

The fourth proportional to 8,445.40, 12,668.10 and 6,890.20 is: 10,335.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,445.40 : 12,668.10 = 6,890.20 : x
  2. Step 2: Convert to fraction form
    8,445.40/12,668.10 = 6,890.20/x
  3. Step 3: Cross multiply
    8,445.40x = 12,668.10 × 6,890.20
  4. Step 4: Simplify right side
    8,445.40x = 87,285,742.62
  5. Step 5: Solve for x
    x = 87,285,742.62/8,445.40
  6. Step 6: Final answer
    x = 10,335.30

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Half scale
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Double scale
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Similar ratio
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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.