Home / 20,915.11-28,863.36-11,355.37

Finding the Fourth Proportional to 20,915.11, 28,863.36 and 11,355.37

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Solution

The fourth proportional to 20,915.11, 28,863.36 and 11,355.37 is: 15,670.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,915.11 : 28,863.36 = 11,355.37 : x
  2. Step 2: Convert to fraction form
    20,915.11/28,863.36 = 11,355.37/x
  3. Step 3: Cross multiply
    20,915.11x = 28,863.36 × 11,355.37
  4. Step 4: Simplify right side
    20,915.11x = 327,754,132.24
  5. Step 5: Solve for x
    x = 327,754,132.24/20,915.11
  6. Step 6: Final answer
    x = 15,670.69

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1.5x scale

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.