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Finding the Fourth Proportional to 9,078.40, 12,529.65 and 8,485.48

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Solution

The fourth proportional to 9,078.40, 12,529.65 and 8,485.48 is: 11,711.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,078.40 : 12,529.65 = 8,485.48 : x
  2. Step 2: Convert to fraction form
    9,078.40/12,529.65 = 8,485.48/x
  3. Step 3: Cross multiply
    9,078.40x = 12,529.65 × 8,485.48
  4. Step 4: Simplify right side
    9,078.40x = 106,320,094.48
  5. Step 5: Solve for x
    x = 106,320,094.48/9,078.40
  6. Step 6: Final answer
    x = 11,711.33

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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 (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.