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Finding the Fourth Proportional to 15,158.28, 20,918.40 and 8,443.84

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Solution

The fourth proportional to 15,158.28, 20,918.40 and 8,443.84 is: 11,652.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,158.28 : 20,918.40 = 8,443.84 : x
  2. Step 2: Convert to fraction form
    15,158.28/20,918.40 = 8,443.84/x
  3. Step 3: Cross multiply
    15,158.28x = 20,918.40 × 8,443.84
  4. Step 4: Simplify right side
    15,158.28x = 176,631,622.66
  5. Step 5: Solve for x
    x = 176,631,622.66/15,158.28
  6. Step 6: Final answer
    x = 11,652.48

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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.