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Finding the Fourth Proportional to 20,657, 30,985.86 and 8,345

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Solution

The fourth proportional to 20,657, 30,985.86 and 8,345 is: 12,517.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,657 : 30,985.86 = 8,345 : x
  2. Step 2: Convert to fraction form
    20,657/30,985.86 = 8,345/x
  3. Step 3: Cross multiply
    20,657x = 30,985.86 × 8,345
  4. Step 4: Simplify right side
    20,657x = 258,577,001.70
  5. Step 5: Solve for x
    x = 258,577,001.70/20,657
  6. Step 6: Final answer
    x = 12,517.65

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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.