Home / 1,245.28-1,716.68-913.12

Finding the Fourth Proportional to 1,245.28, 1,716.68 and 913.12

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Solution

The fourth proportional to 1,245.28, 1,716.68 and 913.12 is: 1,258.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,245.28 : 1,716.68 = 913.12 : x
  2. Step 2: Convert to fraction form
    1,245.28/1,716.68 = 913.12/x
  3. Step 3: Cross multiply
    1,245.28x = 1,716.68 × 913.12
  4. Step 4: Simplify right side
    1,245.28x = 1,567,534.84
  5. Step 5: Solve for x
    x = 1,567,534.84/1,245.28
  6. Step 6: Final answer
    x = 1,258.78

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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.