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Finding the Fourth Proportional to 12,872.88, 17,764.20 and 7,207.68

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Solution

The fourth proportional to 12,872.88, 17,764.20 and 7,207.68 is: 9,946.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,872.88 : 17,764.20 = 7,207.68 : x
  2. Step 2: Convert to fraction form
    12,872.88/17,764.20 = 7,207.68/x
  3. Step 3: Cross multiply
    12,872.88x = 17,764.20 × 7,207.68
  4. Step 4: Simplify right side
    12,872.88x = 128,038,669.06
  5. Step 5: Solve for x
    x = 128,038,669.06/12,872.88
  6. Step 6: Final answer
    x = 9,946.39

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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.