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Finding the Fourth Proportional to 879,175.80, 1,318,763.70 and 820,126.80

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Solution

The fourth proportional to 879,175.80, 1,318,763.70 and 820,126.80 is: 1,230,190.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    879,175.80 : 1,318,763.70 = 820,126.80 : x
  2. Step 2: Convert to fraction form
    879,175.80/1,318,763.70 = 820,126.80/x
  3. Step 3: Cross multiply
    879,175.80x = 1,318,763.70 × 820,126.80
  4. Step 4: Simplify right side
    879,175.80x = 1,081,553,453,237.16
  5. Step 5: Solve for x
    x = 1,081,553,453,237.16/879,175.80
  6. Step 6: Final answer
    x = 1,230,190.20

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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.