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Finding the Fourth Proportional to 271,988.71, 407,982.99 and 85,000.21

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Solution

The fourth proportional to 271,988.71, 407,982.99 and 85,000.21 is: 127,500.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    271,988.71 : 407,982.99 = 85,000.21 : x
  2. Step 2: Convert to fraction form
    271,988.71/407,982.99 = 85,000.21/x
  3. Step 3: Cross multiply
    271,988.71x = 407,982.99 × 85,000.21
  4. Step 4: Simplify right side
    271,988.71x = 34,678,639,826.43
  5. Step 5: Solve for x
    x = 34,678,639,826.43/271,988.71
  6. Step 6: Final answer
    x = 127,500.29

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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.