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Finding the Fourth Proportional to 18,872.42, 28,308.88 and 7,186.28

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Solution

The fourth proportional to 18,872.42, 28,308.88 and 7,186.28 is: 10,779.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,872.42 : 28,308.88 = 7,186.28 : x
  2. Step 2: Convert to fraction form
    18,872.42/28,308.88 = 7,186.28/x
  3. Step 3: Cross multiply
    18,872.42x = 28,308.88 × 7,186.28
  4. Step 4: Simplify right side
    18,872.42x = 203,435,538.17
  5. Step 5: Solve for x
    x = 203,435,538.17/18,872.42
  6. Step 6: Final answer
    x = 10,779.52

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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.