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Finding the Fourth Proportional to 12,285.47, 18,428.21 and 3,520.42

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Solution

The fourth proportional to 12,285.47, 18,428.21 and 3,520.42 is: 5,280.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,285.47 : 18,428.21 = 3,520.42 : x
  2. Step 2: Convert to fraction form
    12,285.47/18,428.21 = 3,520.42/x
  3. Step 3: Cross multiply
    12,285.47x = 18,428.21 × 3,520.42
  4. Step 4: Simplify right side
    12,285.47x = 64,875,039.05
  5. Step 5: Solve for x
    x = 64,875,039.05/12,285.47
  6. Step 6: Final answer
    x = 5,280.63

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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.