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Finding the Fourth Proportional to 1,115.98, 1,539.92 and 644.03

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Solution

The fourth proportional to 1,115.98, 1,539.92 and 644.03 is: 888.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,115.98 : 1,539.92 = 644.03 : x
  2. Step 2: Convert to fraction form
    1,115.98/1,539.92 = 644.03/x
  3. Step 3: Cross multiply
    1,115.98x = 1,539.92 × 644.03
  4. Step 4: Simplify right side
    1,115.98x = 991,754.68
  5. Step 5: Solve for x
    x = 991,754.68/1,115.98
  6. Step 6: Final answer
    x = 888.68

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.