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Finding the Fourth Proportional to 619,429.90, 855,179.70 and 390,183.70

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Solution

The fourth proportional to 619,429.90, 855,179.70 and 390,183.70 is: 538,684.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    619,429.90 : 855,179.70 = 390,183.70 : x
  2. Step 2: Convert to fraction form
    619,429.90/855,179.70 = 390,183.70/x
  3. Step 3: Cross multiply
    619,429.90x = 855,179.70 × 390,183.70
  4. Step 4: Simplify right side
    619,429.90x = 333,677,179,510.89
  5. Step 5: Solve for x
    x = 333,677,179,510.89/619,429.90
  6. Step 6: Final answer
    x = 538,684.33

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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.