Home / 1,391.04-2,083.20-812.16

Finding the Fourth Proportional to 1,391.04, 2,083.20 and 812.16

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Solution

The fourth proportional to 1,391.04, 2,083.20 and 812.16 is: 1,216.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391.04 : 2,083.20 = 812.16 : x
  2. Step 2: Convert to fraction form
    1,391.04/2,083.20 = 812.16/x
  3. Step 3: Cross multiply
    1,391.04x = 2,083.20 × 812.16
  4. Step 4: Simplify right side
    1,391.04x = 1,691,891.71
  5. Step 5: Solve for x
    x = 1,691,891.71/1,391.04
  6. Step 6: Final answer
    x = 1,216.28

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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.