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Finding the Fourth Proportional to 570,958.40, 855,618.40 and 420,020.80

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Solution

The fourth proportional to 570,958.40, 855,618.40 and 420,020.80 is: 629,428.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    570,958.40 : 855,618.40 = 420,020.80 : x
  2. Step 2: Convert to fraction form
    570,958.40/855,618.40 = 420,020.80/x
  3. Step 3: Cross multiply
    570,958.40x = 855,618.40 × 420,020.80
  4. Step 4: Simplify right side
    570,958.40x = 359,377,524,862.72
  5. Step 5: Solve for x
    x = 359,377,524,862.72/570,958.40
  6. Step 6: Final answer
    x = 629,428.56

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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.