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Finding the Fourth Proportional to 1,740.78, 2,610.36 and 644.40

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Solution

The fourth proportional to 1,740.78, 2,610.36 and 644.40 is: 966.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,740.78 : 2,610.36 = 644.40 : x
  2. Step 2: Convert to fraction form
    1,740.78/2,610.36 = 644.40/x
  3. Step 3: Cross multiply
    1,740.78x = 2,610.36 × 644.40
  4. Step 4: Simplify right side
    1,740.78x = 1,682,115.98
  5. Step 5: Solve for x
    x = 1,682,115.98/1,740.78
  6. Step 6: Final answer
    x = 966.30

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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.