Home / 1,315.20-1,814.94-725.69

Finding the Fourth Proportional to 1,315.20, 1,814.94 and 725.69

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Solution

The fourth proportional to 1,315.20, 1,814.94 and 725.69 is: 1,001.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,315.20 : 1,814.94 = 725.69 : x
  2. Step 2: Convert to fraction form
    1,315.20/1,814.94 = 725.69/x
  3. Step 3: Cross multiply
    1,315.20x = 1,814.94 × 725.69
  4. Step 4: Simplify right side
    1,315.20x = 1,317,088.35
  5. Step 5: Solve for x
    x = 1,317,088.35/1,315.20
  6. Step 6: Final answer
    x = 1,001.43

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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.