Home / 3,151.40-4,727.28-811.42

Finding the Fourth Proportional to 3,151.40, 4,727.28 and 811.42

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Solution

The fourth proportional to 3,151.40, 4,727.28 and 811.42 is: 1,217.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,151.40 : 4,727.28 = 811.42 : x
  2. Step 2: Convert to fraction form
    3,151.40/4,727.28 = 811.42/x
  3. Step 3: Cross multiply
    3,151.40x = 4,727.28 × 811.42
  4. Step 4: Simplify right side
    3,151.40x = 3,835,809.54
  5. Step 5: Solve for x
    x = 3,835,809.54/3,151.40
  6. Step 6: Final answer
    x = 1,217.18

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.