Home / 1,687.20-2,328.38-941.15

Finding the Fourth Proportional to 1,687.20, 2,328.38 and 941.15

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Solution

The fourth proportional to 1,687.20, 2,328.38 and 941.15 is: 1,298.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,687.20 : 2,328.38 = 941.15 : x
  2. Step 2: Convert to fraction form
    1,687.20/2,328.38 = 941.15/x
  3. Step 3: Cross multiply
    1,687.20x = 2,328.38 × 941.15
  4. Step 4: Simplify right side
    1,687.20x = 2,191,338.49
  5. Step 5: Solve for x
    x = 2,191,338.49/1,687.20
  6. Step 6: Final answer
    x = 1,298.80

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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.