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Finding the Fourth Proportional to 1,115.39, 1,539.21 and 618.03

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Solution

The fourth proportional to 1,115.39, 1,539.21 and 618.03 is: 852.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,115.39 : 1,539.21 = 618.03 : x
  2. Step 2: Convert to fraction form
    1,115.39/1,539.21 = 618.03/x
  3. Step 3: Cross multiply
    1,115.39x = 1,539.21 × 618.03
  4. Step 4: Simplify right side
    1,115.39x = 951,274.50
  5. Step 5: Solve for x
    x = 951,274.50/1,115.39
  6. Step 6: Final answer
    x = 852.86

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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.