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Finding the Fourth Proportional to 689,529.16, 951,636.90 and 387,721

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Solution

The fourth proportional to 689,529.16, 951,636.90 and 387,721 is: 535,103.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    689,529.16 : 951,636.90 = 387,721 : x
  2. Step 2: Convert to fraction form
    689,529.16/951,636.90 = 387,721/x
  3. Step 3: Cross multiply
    689,529.16x = 951,636.90 × 387,721
  4. Step 4: Simplify right side
    689,529.16x = 368,969,610,504.90
  5. Step 5: Solve for x
    x = 368,969,610,504.90/689,529.16
  6. Step 6: Final answer
    x = 535,103.71

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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.