Home / 1,915.70-2,643.57-1,129.59

Finding the Fourth Proportional to 1,915.70, 2,643.57 and 1,129.59

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Solution

The fourth proportional to 1,915.70, 2,643.57 and 1,129.59 is: 1,558.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,915.70 : 2,643.57 = 1,129.59 : x
  2. Step 2: Convert to fraction form
    1,915.70/2,643.57 = 1,129.59/x
  3. Step 3: Cross multiply
    1,915.70x = 2,643.57 × 1,129.59
  4. Step 4: Simplify right side
    1,915.70x = 2,986,150.24
  5. Step 5: Solve for x
    x = 2,986,150.24/1,915.70
  6. Step 6: Final answer
    x = 1,558.78

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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.