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Finding the Fourth Proportional to 28,375.75, 42,569.89 and 8,655.83

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Solution

The fourth proportional to 28,375.75, 42,569.89 and 8,655.83 is: 12,985.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,375.75 : 42,569.89 = 8,655.83 : x
  2. Step 2: Convert to fraction form
    28,375.75/42,569.89 = 8,655.83/x
  3. Step 3: Cross multiply
    28,375.75x = 42,569.89 × 8,655.83
  4. Step 4: Simplify right side
    28,375.75x = 368,477,656.11
  5. Step 5: Solve for x
    x = 368,477,656.11/28,375.75
  6. Step 6: Final answer
    x = 12,985.65

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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.