Home / 1,039.22-1,436.30-915.90

Finding the Fourth Proportional to 1,039.22, 1,436.30 and 915.90

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Solution

The fourth proportional to 1,039.22, 1,436.30 and 915.90 is: 1,265.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,039.22 : 1,436.30 = 915.90 : x
  2. Step 2: Convert to fraction form
    1,039.22/1,436.30 = 915.90/x
  3. Step 3: Cross multiply
    1,039.22x = 1,436.30 × 915.90
  4. Step 4: Simplify right side
    1,039.22x = 1,315,507.17
  5. Step 5: Solve for x
    x = 1,315,507.17/1,039.22
  6. Step 6: Final answer
    x = 1,265.86

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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.