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Finding the Fourth Proportional to 1,687.68, 2,328.75 and 941.55

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Solution

The fourth proportional to 1,687.68, 2,328.75 and 941.55 is: 1,299.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,687.68 : 2,328.75 = 941.55 : x
  2. Step 2: Convert to fraction form
    1,687.68/2,328.75 = 941.55/x
  3. Step 3: Cross multiply
    1,687.68x = 2,328.75 × 941.55
  4. Step 4: Simplify right side
    1,687.68x = 2,192,634.56
  5. Step 5: Solve for x
    x = 2,192,634.56/1,687.68
  6. Step 6: Final answer
    x = 1,299.20

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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.