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Finding the Fourth Proportional to 18,957.88, 28,431.66 and 7,867.72

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Solution

The fourth proportional to 18,957.88, 28,431.66 and 7,867.72 is: 11,799.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,957.88 : 28,431.66 = 7,867.72 : x
  2. Step 2: Convert to fraction form
    18,957.88/28,431.66 = 7,867.72/x
  3. Step 3: Cross multiply
    18,957.88x = 28,431.66 × 7,867.72
  4. Step 4: Simplify right side
    18,957.88x = 223,692,340.02
  5. Step 5: Solve for x
    x = 223,692,340.02/18,957.88
  6. Step 6: Final answer
    x = 11,799.44

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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.