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Finding the Fourth Proportional to 820,412.80, 1,230,619.20 and 709,820.80

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Solution

The fourth proportional to 820,412.80, 1,230,619.20 and 709,820.80 is: 1,064,731.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    820,412.80 : 1,230,619.20 = 709,820.80 : x
  2. Step 2: Convert to fraction form
    820,412.80/1,230,619.20 = 709,820.80/x
  3. Step 3: Cross multiply
    820,412.80x = 1,230,619.20 × 709,820.80
  4. Step 4: Simplify right side
    820,412.80x = 873,519,105,039.36
  5. Step 5: Solve for x
    x = 873,519,105,039.36/820,412.80
  6. Step 6: Final answer
    x = 1,064,731.20

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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.