Home / 687,454.29-1,029,688.81-420,405.19

Finding the Fourth Proportional to 687,454.29, 1,029,688.81 and 420,405.19

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Solution

The fourth proportional to 687,454.29, 1,029,688.81 and 420,405.19 is: 629,694.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    687,454.29 : 1,029,688.81 = 420,405.19 : x
  2. Step 2: Convert to fraction form
    687,454.29/1,029,688.81 = 420,405.19/x
  3. Step 3: Cross multiply
    687,454.29x = 1,029,688.81 × 420,405.19
  4. Step 4: Simplify right side
    687,454.29x = 432,886,516,183.69
  5. Step 5: Solve for x
    x = 432,886,516,183.69/687,454.29
  6. Step 6: Final answer
    x = 629,694.98

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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.