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Finding the Fourth Proportional to 1,605, 2,405.86 and 873.84

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Solution

The fourth proportional to 1,605, 2,405.86 and 873.84 is: 1,309.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,605 : 2,405.86 = 873.84 : x
  2. Step 2: Convert to fraction form
    1,605/2,405.86 = 873.84/x
  3. Step 3: Cross multiply
    1,605x = 2,405.86 × 873.84
  4. Step 4: Simplify right side
    1,605x = 2,102,336.70
  5. Step 5: Solve for x
    x = 2,102,336.70/1,605
  6. Step 6: Final answer
    x = 1,309.87

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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.