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Finding the Fourth Proportional to 18,848.40, 28,286.64 and 7,184.40

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Solution

The fourth proportional to 18,848.40, 28,286.64 and 7,184.40 is: 10,781.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,848.40 : 28,286.64 = 7,184.40 : x
  2. Step 2: Convert to fraction form
    18,848.40/28,286.64 = 7,184.40/x
  3. Step 3: Cross multiply
    18,848.40x = 28,286.64 × 7,184.40
  4. Step 4: Simplify right side
    18,848.40x = 203,222,536.42
  5. Step 5: Solve for x
    x = 203,222,536.42/18,848.40
  6. Step 6: Final answer
    x = 10,781.95

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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.