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Finding the Fourth Proportional to 1,211.83, 1,670.33 and 857.30

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Solution

The fourth proportional to 1,211.83, 1,670.33 and 857.30 is: 1,181.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211.83 : 1,670.33 = 857.30 : x
  2. Step 2: Convert to fraction form
    1,211.83/1,670.33 = 857.30/x
  3. Step 3: Cross multiply
    1,211.83x = 1,670.33 × 857.30
  4. Step 4: Simplify right side
    1,211.83x = 1,431,973.91
  5. Step 5: Solve for x
    x = 1,431,973.91/1,211.83
  6. Step 6: Final answer
    x = 1,181.66

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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.