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Finding the Fourth Proportional to 1,638.50, 2,458.11 and 612.50

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Solution

The fourth proportional to 1,638.50, 2,458.11 and 612.50 is: 918.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,638.50 : 2,458.11 = 612.50 : x
  2. Step 2: Convert to fraction form
    1,638.50/2,458.11 = 612.50/x
  3. Step 3: Cross multiply
    1,638.50x = 2,458.11 × 612.50
  4. Step 4: Simplify right side
    1,638.50x = 1,505,592.38
  5. Step 5: Solve for x
    x = 1,505,592.38/1,638.50
  6. Step 6: Final answer
    x = 918.88

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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.