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Finding the Fourth Proportional to 1,615.85, 2,423.79 and 641.96

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Solution

The fourth proportional to 1,615.85, 2,423.79 and 641.96 is: 962.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,615.85 : 2,423.79 = 641.96 : x
  2. Step 2: Convert to fraction form
    1,615.85/2,423.79 = 641.96/x
  3. Step 3: Cross multiply
    1,615.85x = 2,423.79 × 641.96
  4. Step 4: Simplify right side
    1,615.85x = 1,555,973.20
  5. Step 5: Solve for x
    x = 1,555,973.20/1,615.85
  6. Step 6: Final answer
    x = 962.94

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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.