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Finding the Fourth Proportional to 1,605.85, 2,405.25 and 987.67

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Solution

The fourth proportional to 1,605.85, 2,405.25 and 987.67 is: 1,479.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,605.85 : 2,405.25 = 987.67 : x
  2. Step 2: Convert to fraction form
    1,605.85/2,405.25 = 987.67/x
  3. Step 3: Cross multiply
    1,605.85x = 2,405.25 × 987.67
  4. Step 4: Simplify right side
    1,605.85x = 2,375,596.27
  5. Step 5: Solve for x
    x = 2,375,596.27/1,605.85
  6. Step 6: Final answer
    x = 1,479.34

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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.