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Finding the Fourth Proportional to 28,405.59, 42,608.50 and 8,684.11

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Solution

The fourth proportional to 28,405.59, 42,608.50 and 8,684.11 is: 13,026.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,405.59 : 42,608.50 = 8,684.11 : x
  2. Step 2: Convert to fraction form
    28,405.59/42,608.50 = 8,684.11/x
  3. Step 3: Cross multiply
    28,405.59x = 42,608.50 × 8,684.11
  4. Step 4: Simplify right side
    28,405.59x = 370,016,932.49
  5. Step 5: Solve for x
    x = 370,016,932.49/28,405.59
  6. Step 6: Final answer
    x = 13,026.20

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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.