Home / 1,687.96-2,328.38-1,247

Finding the Fourth Proportional to 1,687.96, 2,328.38 and 1,247

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Solution

The fourth proportional to 1,687.96, 2,328.38 and 1,247 is: 1,720.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,687.96 : 2,328.38 = 1,247 : x
  2. Step 2: Convert to fraction form
    1,687.96/2,328.38 = 1,247/x
  3. Step 3: Cross multiply
    1,687.96x = 2,328.38 × 1,247
  4. Step 4: Simplify right side
    1,687.96x = 2,903,489.86
  5. Step 5: Solve for x
    x = 2,903,489.86/1,687.96
  6. Step 6: Final answer
    x = 1,720.12

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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.