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Finding the Fourth Proportional to 1,615.64, 2,421 and 641.24

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Solution

The fourth proportional to 1,615.64, 2,421 and 641.24 is: 960.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,615.64 : 2,421 = 641.24 : x
  2. Step 2: Convert to fraction form
    1,615.64/2,421 = 641.24/x
  3. Step 3: Cross multiply
    1,615.64x = 2,421 × 641.24
  4. Step 4: Simplify right side
    1,615.64x = 1,552,442.04
  5. Step 5: Solve for x
    x = 1,552,442.04/1,615.64
  6. Step 6: Final answer
    x = 960.88

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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.