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Finding the Fourth Proportional to 12,690.46, 17,520.74 and 8,154.97

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Solution

The fourth proportional to 12,690.46, 17,520.74 and 8,154.97 is: 11,258.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,690.46 : 17,520.74 = 8,154.97 : x
  2. Step 2: Convert to fraction form
    12,690.46/17,520.74 = 8,154.97/x
  3. Step 3: Cross multiply
    12,690.46x = 17,520.74 × 8,154.97
  4. Step 4: Simplify right side
    12,690.46x = 142,881,109.08
  5. Step 5: Solve for x
    x = 142,881,109.08/12,690.46
  6. Step 6: Final answer
    x = 11,258.94

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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.