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Finding the Fourth Proportional to 12,410.40, 18,615.60 and 8,911.20

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Solution

The fourth proportional to 12,410.40, 18,615.60 and 8,911.20 is: 13,366.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,410.40 : 18,615.60 = 8,911.20 : x
  2. Step 2: Convert to fraction form
    12,410.40/18,615.60 = 8,911.20/x
  3. Step 3: Cross multiply
    12,410.40x = 18,615.60 × 8,911.20
  4. Step 4: Simplify right side
    12,410.40x = 165,887,334.72
  5. Step 5: Solve for x
    x = 165,887,334.72/12,410.40
  6. Step 6: Final answer
    x = 13,366.80

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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.