Home / 1,915.28-2,643.38-1,129.40

Finding the Fourth Proportional to 1,915.28, 2,643.38 and 1,129.40

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Solution

The fourth proportional to 1,915.28, 2,643.38 and 1,129.40 is: 1,558.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,915.28 : 2,643.38 = 1,129.40 : x
  2. Step 2: Convert to fraction form
    1,915.28/2,643.38 = 1,129.40/x
  3. Step 3: Cross multiply
    1,915.28x = 2,643.38 × 1,129.40
  4. Step 4: Simplify right side
    1,915.28x = 2,985,433.37
  5. Step 5: Solve for x
    x = 2,985,433.37/1,915.28
  6. Step 6: Final answer
    x = 1,558.75

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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.