Home / 1,578.22-2,177.90-915.03

Finding the Fourth Proportional to 1,578.22, 2,177.90 and 915.03

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Solution

The fourth proportional to 1,578.22, 2,177.90 and 915.03 is: 1,262.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,578.22 : 2,177.90 = 915.03 : x
  2. Step 2: Convert to fraction form
    1,578.22/2,177.90 = 915.03/x
  3. Step 3: Cross multiply
    1,578.22x = 2,177.90 × 915.03
  4. Step 4: Simplify right side
    1,578.22x = 1,992,843.84
  5. Step 5: Solve for x
    x = 1,992,843.84/1,578.22
  6. Step 6: Final answer
    x = 1,262.72

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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.