Home / 1,915.48-2,643.32-1,129.78

Finding the Fourth Proportional to 1,915.48, 2,643.32 and 1,129.78

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Solution

The fourth proportional to 1,915.48, 2,643.32 and 1,129.78 is: 1,559.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,915.48 : 2,643.32 = 1,129.78 : x
  2. Step 2: Convert to fraction form
    1,915.48/2,643.32 = 1,129.78/x
  3. Step 3: Cross multiply
    1,915.48x = 2,643.32 × 1,129.78
  4. Step 4: Simplify right side
    1,915.48x = 2,986,351.20
  5. Step 5: Solve for x
    x = 2,986,351.20/1,915.48
  6. Step 6: Final answer
    x = 1,559.07

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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.