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Finding the Fourth Proportional to 810,415.20, 1,213,873.20 and 705,439.20

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Solution

The fourth proportional to 810,415.20, 1,213,873.20 and 705,439.20 is: 1,056,635.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    810,415.20 : 1,213,873.20 = 705,439.20 : x
  2. Step 2: Convert to fraction form
    810,415.20/1,213,873.20 = 705,439.20/x
  3. Step 3: Cross multiply
    810,415.20x = 1,213,873.20 × 705,439.20
  4. Step 4: Simplify right side
    810,415.20x = 856,313,739,109.44
  5. Step 5: Solve for x
    x = 856,313,739,109.44/810,415.20
  6. Step 6: Final answer
    x = 1,056,635.83

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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.