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Finding the Fourth Proportional to 13,568.16, 18,717.84 and 7,978.08

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Solution

The fourth proportional to 13,568.16, 18,717.84 and 7,978.08 is: 11,006.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,568.16 : 18,717.84 = 7,978.08 : x
  2. Step 2: Convert to fraction form
    13,568.16/18,717.84 = 7,978.08/x
  3. Step 3: Cross multiply
    13,568.16x = 18,717.84 × 7,978.08
  4. Step 4: Simplify right side
    13,568.16x = 149,332,424.95
  5. Step 5: Solve for x
    x = 149,332,424.95/13,568.16
  6. Step 6: Final answer
    x = 11,006.09

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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.