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Finding the Fourth Proportional to 485,402.70, 669,800.36 and 281,411.09

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Solution

The fourth proportional to 485,402.70, 669,800.36 and 281,411.09 is: 388,315.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,402.70 : 669,800.36 = 281,411.09 : x
  2. Step 2: Convert to fraction form
    485,402.70/669,800.36 = 281,411.09/x
  3. Step 3: Cross multiply
    485,402.70x = 669,800.36 × 281,411.09
  4. Step 4: Simplify right side
    485,402.70x = 188,489,244,633.94
  5. Step 5: Solve for x
    x = 188,489,244,633.94/485,402.70
  6. Step 6: Final answer
    x = 388,315.20

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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.