Home / 20,915.58-28,863.29-11,355.55

Finding the Fourth Proportional to 20,915.58, 28,863.29 and 11,355.55

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Solution

The fourth proportional to 20,915.58, 28,863.29 and 11,355.55 is: 15,670.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,915.58 : 28,863.29 = 11,355.55 : x
  2. Step 2: Convert to fraction form
    20,915.58/28,863.29 = 11,355.55/x
  3. Step 3: Cross multiply
    20,915.58x = 28,863.29 × 11,355.55
  4. Step 4: Simplify right side
    20,915.58x = 327,758,699.92
  5. Step 5: Solve for x
    x = 327,758,699.92/20,915.58
  6. Step 6: Final answer
    x = 15,670.55

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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.