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Finding the Fourth Proportional to 420,801.90, 580,707.27 and 239,513.83

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Solution

The fourth proportional to 420,801.90, 580,707.27 and 239,513.83 is: 330,529.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,801.90 : 580,707.27 = 239,513.83 : x
  2. Step 2: Convert to fraction form
    420,801.90/580,707.27 = 239,513.83/x
  3. Step 3: Cross multiply
    420,801.90x = 580,707.27 × 239,513.83
  4. Step 4: Simplify right side
    420,801.90x = 139,087,419,443.01
  5. Step 5: Solve for x
    x = 139,087,419,443.01/420,801.90
  6. Step 6: Final answer
    x = 330,529.45

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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.