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Finding the Fourth Proportional to 8,130.40, 12,195.60 and 7,285.60

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Solution

The fourth proportional to 8,130.40, 12,195.60 and 7,285.60 is: 10,928.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,130.40 : 12,195.60 = 7,285.60 : x
  2. Step 2: Convert to fraction form
    8,130.40/12,195.60 = 7,285.60/x
  3. Step 3: Cross multiply
    8,130.40x = 12,195.60 × 7,285.60
  4. Step 4: Simplify right side
    8,130.40x = 88,852,263.36
  5. Step 5: Solve for x
    x = 88,852,263.36/8,130.40
  6. Step 6: Final answer
    x = 10,928.40

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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.