Home / 1,915.31-2,643.13-1,129.36

Finding the Fourth Proportional to 1,915.31, 2,643.13 and 1,129.36

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Solution

The fourth proportional to 1,915.31, 2,643.13 and 1,129.36 is: 1,558.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,915.31 : 2,643.13 = 1,129.36 : x
  2. Step 2: Convert to fraction form
    1,915.31/2,643.13 = 1,129.36/x
  3. Step 3: Cross multiply
    1,915.31x = 2,643.13 × 1,129.36
  4. Step 4: Simplify right side
    1,915.31x = 2,985,045.06
  5. Step 5: Solve for x
    x = 2,985,045.06/1,915.31
  6. Step 6: Final answer
    x = 1,558.52

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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.