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Finding the Fourth Proportional to 303,989.78, 455,983.76 and 213,660.61

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Solution

The fourth proportional to 303,989.78, 455,983.76 and 213,660.61 is: 320,490.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    303,989.78 : 455,983.76 = 213,660.61 : x
  2. Step 2: Convert to fraction form
    303,989.78/455,983.76 = 213,660.61/x
  3. Step 3: Cross multiply
    303,989.78x = 455,983.76 × 213,660.61
  4. Step 4: Simplify right side
    303,989.78x = 97,425,767,705.89
  5. Step 5: Solve for x
    x = 97,425,767,705.89/303,989.78
  6. Step 6: Final answer
    x = 320,490.27

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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.