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Finding the Fourth Proportional to 1,615.31, 2,423.51 and 641.69

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Solution

The fourth proportional to 1,615.31, 2,423.51 and 641.69 is: 962.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,615.31 : 2,423.51 = 641.69 : x
  2. Step 2: Convert to fraction form
    1,615.31/2,423.51 = 641.69/x
  3. Step 3: Cross multiply
    1,615.31x = 2,423.51 × 641.69
  4. Step 4: Simplify right side
    1,615.31x = 1,555,138.92
  5. Step 5: Solve for x
    x = 1,555,138.92/1,615.31
  6. Step 6: Final answer
    x = 962.75

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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.