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Finding the Fourth Proportional to 1,211.15, 1,671.98 and 857.39

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Solution

The fourth proportional to 1,211.15, 1,671.98 and 857.39 is: 1,183.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211.15 : 1,671.98 = 857.39 : x
  2. Step 2: Convert to fraction form
    1,211.15/1,671.98 = 857.39/x
  3. Step 3: Cross multiply
    1,211.15x = 1,671.98 × 857.39
  4. Step 4: Simplify right side
    1,211.15x = 1,433,526.29
  5. Step 5: Solve for x
    x = 1,433,526.29/1,211.15
  6. Step 6: Final answer
    x = 1,183.61

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1.5x scale

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.