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Finding the Fourth Proportional to 1,687.06, 2,328.12 and 940.96

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Solution

The fourth proportional to 1,687.06, 2,328.12 and 940.96 is: 1,298.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,687.06 : 2,328.12 = 940.96 : x
  2. Step 2: Convert to fraction form
    1,687.06/2,328.12 = 940.96/x
  3. Step 3: Cross multiply
    1,687.06x = 2,328.12 × 940.96
  4. Step 4: Simplify right side
    1,687.06x = 2,190,667.80
  5. Step 5: Solve for x
    x = 2,190,667.80/1,687.06
  6. Step 6: Final answer
    x = 1,298.51

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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.