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Finding the Fourth Proportional to 12,915.36, 17,828.64 and 8,729.28

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Solution

The fourth proportional to 12,915.36, 17,828.64 and 8,729.28 is: 12,050.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,915.36 : 17,828.64 = 8,729.28 : x
  2. Step 2: Convert to fraction form
    12,915.36/17,828.64 = 8,729.28/x
  3. Step 3: Cross multiply
    12,915.36x = 17,828.64 × 8,729.28
  4. Step 4: Simplify right side
    12,915.36x = 155,631,190.58
  5. Step 5: Solve for x
    x = 155,631,190.58/12,915.36
  6. Step 6: Final answer
    x = 12,050.09

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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.