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Finding the Fourth Proportional to 8,405, 12,607.50 and 2,933

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Solution

The fourth proportional to 8,405, 12,607.50 and 2,933 is: 4,399.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,405 : 12,607.50 = 2,933 : x
  2. Step 2: Convert to fraction form
    8,405/12,607.50 = 2,933/x
  3. Step 3: Cross multiply
    8,405x = 12,607.50 × 2,933
  4. Step 4: Simplify right side
    8,405x = 36,977,797.50
  5. Step 5: Solve for x
    x = 36,977,797.50/8,405
  6. Step 6: Final answer
    x = 4,399.50

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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.