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Finding the Fourth Proportional to 1,207.89, 1,666.84 and 853.44

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Solution

The fourth proportional to 1,207.89, 1,666.84 and 853.44 is: 1,177.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,207.89 : 1,666.84 = 853.44 : x
  2. Step 2: Convert to fraction form
    1,207.89/1,666.84 = 853.44/x
  3. Step 3: Cross multiply
    1,207.89x = 1,666.84 × 853.44
  4. Step 4: Simplify right side
    1,207.89x = 1,422,547.93
  5. Step 5: Solve for x
    x = 1,422,547.93/1,207.89
  6. Step 6: Final answer
    x = 1,177.71

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.