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Finding the Fourth Proportional to 15,155.94, 20,915.24 and 8,783.77

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Solution

The fourth proportional to 15,155.94, 20,915.24 and 8,783.77 is: 12,121.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,155.94 : 20,915.24 = 8,783.77 : x
  2. Step 2: Convert to fraction form
    15,155.94/20,915.24 = 8,783.77/x
  3. Step 3: Cross multiply
    15,155.94x = 20,915.24 × 8,783.77
  4. Step 4: Simplify right side
    15,155.94x = 183,714,566.54
  5. Step 5: Solve for x
    x = 183,714,566.54/15,155.94
  6. Step 6: Final answer
    x = 12,121.62

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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.