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Finding the Fourth Proportional to 1,612.53, 2,419.11 and 638.64

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Solution

The fourth proportional to 1,612.53, 2,419.11 and 638.64 is: 958.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,612.53 : 2,419.11 = 638.64 : x
  2. Step 2: Convert to fraction form
    1,612.53/2,419.11 = 638.64/x
  3. Step 3: Cross multiply
    1,612.53x = 2,419.11 × 638.64
  4. Step 4: Simplify right side
    1,612.53x = 1,544,940.41
  5. Step 5: Solve for x
    x = 1,544,940.41/1,612.53
  6. Step 6: Final answer
    x = 958.08

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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.