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Finding the Fourth Proportional to 1,614.76, 2,421.54 and 641

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Solution

The fourth proportional to 1,614.76, 2,421.54 and 641 is: 961.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,614.76 : 2,421.54 = 641 : x
  2. Step 2: Convert to fraction form
    1,614.76/2,421.54 = 641/x
  3. Step 3: Cross multiply
    1,614.76x = 2,421.54 × 641
  4. Step 4: Simplify right side
    1,614.76x = 1,552,207.14
  5. Step 5: Solve for x
    x = 1,552,207.14/1,614.76
  6. Step 6: Final answer
    x = 961.26

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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.