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Finding the Fourth Proportional to 28,609.60, 42,856.80 and 18,184

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Solution

The fourth proportional to 28,609.60, 42,856.80 and 18,184 is: 27,239.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,609.60 : 42,856.80 = 18,184 : x
  2. Step 2: Convert to fraction form
    28,609.60/42,856.80 = 18,184/x
  3. Step 3: Cross multiply
    28,609.60x = 42,856.80 × 18,184
  4. Step 4: Simplify right side
    28,609.60x = 779,308,051.20
  5. Step 5: Solve for x
    x = 779,308,051.20/28,609.60
  6. Step 6: Final answer
    x = 27,239.39

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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.