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Finding the Fourth Proportional to 20,985, 31,477.50 and 6,393

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Solution

The fourth proportional to 20,985, 31,477.50 and 6,393 is: 9,589.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,985 : 31,477.50 = 6,393 : x
  2. Step 2: Convert to fraction form
    20,985/31,477.50 = 6,393/x
  3. Step 3: Cross multiply
    20,985x = 31,477.50 × 6,393
  4. Step 4: Simplify right side
    20,985x = 201,235,657.50
  5. Step 5: Solve for x
    x = 201,235,657.50/20,985
  6. Step 6: Final answer
    x = 9,589.50

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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.