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Finding the Fourth Proportional to 15,138.85, 20,888.22 and 9,170.41

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Solution

The fourth proportional to 15,138.85, 20,888.22 and 9,170.41 is: 12,653.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,138.85 : 20,888.22 = 9,170.41 : x
  2. Step 2: Convert to fraction form
    15,138.85/20,888.22 = 9,170.41/x
  3. Step 3: Cross multiply
    15,138.85x = 20,888.22 × 9,170.41
  4. Step 4: Simplify right side
    15,138.85x = 191,553,541.57
  5. Step 5: Solve for x
    x = 191,553,541.57/15,138.85
  6. Step 6: Final answer
    x = 12,653.11

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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.