Home / 1,915.20-2,643.32-1,129.20

Finding the Fourth Proportional to 1,915.20, 2,643.32 and 1,129.20

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Solution

The fourth proportional to 1,915.20, 2,643.32 and 1,129.20 is: 1,558.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,915.20 : 2,643.32 = 1,129.20 : x
  2. Step 2: Convert to fraction form
    1,915.20/2,643.32 = 1,129.20/x
  3. Step 3: Cross multiply
    1,915.20x = 2,643.32 × 1,129.20
  4. Step 4: Simplify right side
    1,915.20x = 2,984,836.94
  5. Step 5: Solve for x
    x = 2,984,836.94/1,915.20
  6. Step 6: Final answer
    x = 1,558.50

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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.