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Finding the Fourth Proportional to 458,665.40, 687,998.10 and 279,039.80

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Solution

The fourth proportional to 458,665.40, 687,998.10 and 279,039.80 is: 418,559.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    458,665.40 : 687,998.10 = 279,039.80 : x
  2. Step 2: Convert to fraction form
    458,665.40/687,998.10 = 279,039.80/x
  3. Step 3: Cross multiply
    458,665.40x = 687,998.10 × 279,039.80
  4. Step 4: Simplify right side
    458,665.40x = 191,978,852,224.38
  5. Step 5: Solve for x
    x = 191,978,852,224.38/458,665.40
  6. Step 6: Final answer
    x = 418,559.70

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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.