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Finding the Fourth Proportional to 18,885.30, 28,258.07 and 11,393.20

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Solution

The fourth proportional to 18,885.30, 28,258.07 and 11,393.20 is: 17,047.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,885.30 : 28,258.07 = 11,393.20 : x
  2. Step 2: Convert to fraction form
    18,885.30/28,258.07 = 11,393.20/x
  3. Step 3: Cross multiply
    18,885.30x = 28,258.07 × 11,393.20
  4. Step 4: Simplify right side
    18,885.30x = 321,949,891.38
  5. Step 5: Solve for x
    x = 321,949,891.38/18,885.30
  6. Step 6: Final answer
    x = 17,047.64

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.