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Finding the Fourth Proportional to 8,665.40, 12,998.10 and 5,166.20

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Solution

The fourth proportional to 8,665.40, 12,998.10 and 5,166.20 is: 7,749.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,665.40 : 12,998.10 = 5,166.20 : x
  2. Step 2: Convert to fraction form
    8,665.40/12,998.10 = 5,166.20/x
  3. Step 3: Cross multiply
    8,665.40x = 12,998.10 × 5,166.20
  4. Step 4: Simplify right side
    8,665.40x = 67,150,784.22
  5. Step 5: Solve for x
    x = 67,150,784.22/8,665.40
  6. Step 6: Final answer
    x = 7,749.30

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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.