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Finding the Fourth Proportional to 8,128.40, 11,355.10 and 8,128.40

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Solution

The fourth proportional to 8,128.40, 11,355.10 and 8,128.40 is: 11,355.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,128.40 : 11,355.10 = 8,128.40 : x
  2. Step 2: Convert to fraction form
    8,128.40/11,355.10 = 8,128.40/x
  3. Step 3: Cross multiply
    8,128.40x = 11,355.10 × 8,128.40
  4. Step 4: Simplify right side
    8,128.40x = 92,298,794.84
  5. Step 5: Solve for x
    x = 92,298,794.84/8,128.40
  6. Step 6: Final answer
    x = 11,355.10

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Half scale
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Double scale
Find fourth proportional to 8,129.40, 11,356.50 and 8,129.40
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.