Home / 1,121.06-1,682.08-391.16

Finding the Fourth Proportional to 1,121.06, 1,682.08 and 391.16

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Solution

The fourth proportional to 1,121.06, 1,682.08 and 391.16 is: 586.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.06 : 1,682.08 = 391.16 : x
  2. Step 2: Convert to fraction form
    1,121.06/1,682.08 = 391.16/x
  3. Step 3: Cross multiply
    1,121.06x = 1,682.08 × 391.16
  4. Step 4: Simplify right side
    1,121.06x = 657,962.41
  5. Step 5: Solve for x
    x = 657,962.41/1,121.06
  6. Step 6: Final answer
    x = 586.91

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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.