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Finding the Fourth Proportional to 206,285.40, 309,428.10 and 87,968.70

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Solution

The fourth proportional to 206,285.40, 309,428.10 and 87,968.70 is: 131,953.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    206,285.40 : 309,428.10 = 87,968.70 : x
  2. Step 2: Convert to fraction form
    206,285.40/309,428.10 = 87,968.70/x
  3. Step 3: Cross multiply
    206,285.40x = 309,428.10 × 87,968.70
  4. Step 4: Simplify right side
    206,285.40x = 27,219,987,700.47
  5. Step 5: Solve for x
    x = 27,219,987,700.47/206,285.40
  6. Step 6: Final answer
    x = 131,953.05

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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.