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Finding the Fourth Proportional to 1,072.80, 1,605.78 and 853.92

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Solution

The fourth proportional to 1,072.80, 1,605.78 and 853.92 is: 1,278.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,072.80 : 1,605.78 = 853.92 : x
  2. Step 2: Convert to fraction form
    1,072.80/1,605.78 = 853.92/x
  3. Step 3: Cross multiply
    1,072.80x = 1,605.78 × 853.92
  4. Step 4: Simplify right side
    1,072.80x = 1,371,207.66
  5. Step 5: Solve for x
    x = 1,371,207.66/1,072.80
  6. Step 6: Final answer
    x = 1,278.16

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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.