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Finding the Fourth Proportional to 12,836.78, 17,707.36 and 7,728.74

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Solution

The fourth proportional to 12,836.78, 17,707.36 and 7,728.74 is: 10,661.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,836.78 : 17,707.36 = 7,728.74 : x
  2. Step 2: Convert to fraction form
    12,836.78/17,707.36 = 7,728.74/x
  3. Step 3: Cross multiply
    12,836.78x = 17,707.36 × 7,728.74
  4. Step 4: Simplify right side
    12,836.78x = 136,855,581.53
  5. Step 5: Solve for x
    x = 136,855,581.53/12,836.78
  6. Step 6: Final answer
    x = 10,661.21

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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.