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Finding the Fourth Proportional to 12,988.64, 17,931.51 and 8,518.97

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Solution

The fourth proportional to 12,988.64, 17,931.51 and 8,518.97 is: 11,760.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,988.64 : 17,931.51 = 8,518.97 : x
  2. Step 2: Convert to fraction form
    12,988.64/17,931.51 = 8,518.97/x
  3. Step 3: Cross multiply
    12,988.64x = 17,931.51 × 8,518.97
  4. Step 4: Simplify right side
    12,988.64x = 152,757,906.09
  5. Step 5: Solve for x
    x = 152,757,906.09/12,988.64
  6. Step 6: Final answer
    x = 11,760.89

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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.