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Finding the Fourth Proportional to 865,651.80, 1,298,477.70 and 853,210.20

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Solution

The fourth proportional to 865,651.80, 1,298,477.70 and 853,210.20 is: 1,279,815.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    865,651.80 : 1,298,477.70 = 853,210.20 : x
  2. Step 2: Convert to fraction form
    865,651.80/1,298,477.70 = 853,210.20/x
  3. Step 3: Cross multiply
    865,651.80x = 1,298,477.70 × 853,210.20
  4. Step 4: Simplify right side
    865,651.80x = 1,107,874,418,112.54
  5. Step 5: Solve for x
    x = 1,107,874,418,112.54/865,651.80
  6. Step 6: Final answer
    x = 1,279,815.30

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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.