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Finding the Fourth Proportional to 20,455.40, 30,683.10 and 18,487.10

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Solution

The fourth proportional to 20,455.40, 30,683.10 and 18,487.10 is: 27,730.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,455.40 : 30,683.10 = 18,487.10 : x
  2. Step 2: Convert to fraction form
    20,455.40/30,683.10 = 18,487.10/x
  3. Step 3: Cross multiply
    20,455.40x = 30,683.10 × 18,487.10
  4. Step 4: Simplify right side
    20,455.40x = 567,241,538.01
  5. Step 5: Solve for x
    x = 567,241,538.01/20,455.40
  6. Step 6: Final answer
    x = 27,730.65

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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.