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Finding the Fourth Proportional to 420,987.15, 580,883.13 and 239,688.09

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Solution

The fourth proportional to 420,987.15, 580,883.13 and 239,688.09 is: 330,724.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,987.15 : 580,883.13 = 239,688.09 : x
  2. Step 2: Convert to fraction form
    420,987.15/580,883.13 = 239,688.09/x
  3. Step 3: Cross multiply
    420,987.15x = 580,883.13 × 239,688.09
  4. Step 4: Simplify right side
    420,987.15x = 139,230,767,942.92
  5. Step 5: Solve for x
    x = 139,230,767,942.92/420,987.15
  6. Step 6: Final answer
    x = 330,724.51

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.