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Finding the Fourth Proportional to 840,655, 1,260,993.30 and 279,689.68

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Solution

The fourth proportional to 840,655, 1,260,993.30 and 279,689.68 is: 419,538.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    840,655 : 1,260,993.30 = 279,689.68 : x
  2. Step 2: Convert to fraction form
    840,655/1,260,993.30 = 279,689.68/x
  3. Step 3: Cross multiply
    840,655x = 1,260,993.30 × 279,689.68
  4. Step 4: Simplify right side
    840,655x = 352,686,812,559.14
  5. Step 5: Solve for x
    x = 352,686,812,559.14/840,655
  6. Step 6: Final answer
    x = 419,538.11

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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.