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Finding the Fourth Proportional to 1,778.16, 2,666.49 and 853.50

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Solution

The fourth proportional to 1,778.16, 2,666.49 and 853.50 is: 1,279.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,778.16 : 2,666.49 = 853.50 : x
  2. Step 2: Convert to fraction form
    1,778.16/2,666.49 = 853.50/x
  3. Step 3: Cross multiply
    1,778.16x = 2,666.49 × 853.50
  4. Step 4: Simplify right side
    1,778.16x = 2,275,849.22
  5. Step 5: Solve for x
    x = 2,275,849.22/1,778.16
  6. Step 6: Final answer
    x = 1,279.89

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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.