Home / 20,915.85-28,864.09-11,355.82

Finding the Fourth Proportional to 20,915.85, 28,864.09 and 11,355.82

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Solution

The fourth proportional to 20,915.85, 28,864.09 and 11,355.82 is: 15,671.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,915.85 : 28,864.09 = 11,355.82 : x
  2. Step 2: Convert to fraction form
    20,915.85/28,864.09 = 11,355.82/x
  3. Step 3: Cross multiply
    20,915.85x = 28,864.09 × 11,355.82
  4. Step 4: Simplify right side
    20,915.85x = 327,775,451.02
  5. Step 5: Solve for x
    x = 327,775,451.02/20,915.85
  6. Step 6: Final answer
    x = 15,671.15

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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.